Few thoughts on this (i used them in my currently on vacation timeline)
A surviving Yorkist dynasty means a couple of things - a more secure succession than under the Tudors, stronger martial ties with mainland Europe (even if only a couple of Edward IV's daughter's planned matches came off then that is pretty impressive - they are also the first English princesses for almost sixty years or so).
If they continue pursuing a Breton match then war with France is inevitable (Francis II was determined to maintain Breton independence in the event of his daughter being his heir - an English or Austrian/Burgundian match is the most obvious way of doing that).
If England succeeds in marrying the Breton heir then maintaining her duchy is going to set up virtual permanent war with France over the next few decades - France's ambitions in Italy means England gets tied alongside Spain and the Empire in that conflict too.
The cost of the Italian wars was a major need for the papacy to increase its income and that alongside other things was a factor in growing dissatisfaction and distrust of the Church particularly in northern Europe.
England's trade was very dependent on areas that did become heavily influenced by reforming voices so you can't rule out a bottom down reformation (as happened in Scotland for example). A future Edward VI or VII or Richard III or IV - perhaps having received an excellent education and married to a reform minded consort might well see the advantages that Henry VIII did and slowly move to reform.
The early Tudor court was very much like the Yorkist court - much of Henry VII's administration was similar to that of Edward IV's - who had started the process of tying the country gentry more to the crown and the court (giving them more say in their localities etc) than in the past when their access relied on their relationship with their local major aristocratic landowner (in effect these were the new men who dominated England in the 16th century)
Here's a rough direct line and the events it impacted
Edward IV (1461 to 1492) m Elizabeth Woodville
Edward V (1492 to 1527) m Anne Duchess of Brittany
Edward VI (1527 to 1548) m Margaret of Anjouleme
Richard III (1548 to 1568) m 1) Elizabeth of Scotland 2) Eleanor of Brabant
Notes:
Edward IV survived his illness in 1483 to reign until his death in 1492.
The success of his marital adventures saw his children on many thrones across Europe.
His daughter Elizabeth became the second wife of the Emperor Maximillian, Cecily became the wife of James IV of Scotland, Anne married Philip the Fair and Catherine married Juan Prince of The Asturias in a series of anti-French marital alliances in the late 1480s.
After a brief war Edward Prince of Wales was married to Anne of Brittany (who bore her husband two surviving children)
Edward V initially avoided conflict but long resentments with France and a close relationship with his brother in law Philip of Burgundy (now the Duke of Brabant) resulted in a general conflict prompted over the contested French, Austrian and Spanish claims in Italy which England joined - the papacy swapped sides to suit itself eventually allying with the French and a forced treaty supported by the Papacy saw English gains limited to retaining Calais, La Rochelle and Brittany and the King's son was forced to marry Margaret of Anjouleme - the failure of the war of 1509 and what the English saw as a pro-French papacy would have a lasting impact.
Edward VI's court became a centre of humanist and new learning in the 1530s due to the influence of the Queen. The Queen's humanism and the King's resentment and distrust of the Papacy in the 1520s saw a weakening of ties with Rome though the royal couple remained traditional in their relationship with the church. However greater demands for reform were made and the King intervened to limit the church's attacks on heretics in his later reign. The Papal representative described London with its strong ties to merchants in the Netherlands and Germany as a "veritable brothel of Lutherans, heretics and others that the King and Bishop do allow to roam and preach free from all harm"
Richard III was largely educated by Thomas Crammer (he began life as an Oxford cleric before being appointed to chaplain to Queen Margaret rapidly rising to become first Bishop of London, then Lord Chancellor and Archbishop of York by 1547) and he was much closer in view to the Protestant thinking emenating from Germany and the Low Countries. Crammer's influence on Richard III particularly his views on the Biblical authority of King's was largely blamed for England's final breach with Rome - In 1549 Crammer guided legislation through Parliament establishing Richard as Head of the Church in England. Further reforms in 1550-1555 dissolved the monastic institutions and abolished the Papal supremacy. His marriage to Elizabeth of Scotland daughter of James V (died 1554) was relatively happy despite the Queen's traditional Catholicism. Her death in childbirth in 1554 in midst of the Royal Supremacy row was seen as hardening Richard's attitude. In 1557 Richard remarried to Eleanor daughter of the Duke of Brabant - the new Protestant Queen proved a loyal supporter of her husband's religious policies and was a keen promoter of education.
A surviving Yorkist dynasty means a couple of things - a more secure succession than under the Tudors, stronger martial ties with mainland Europe (even if only a couple of Edward IV's daughter's planned matches came off then that is pretty impressive - they are also the first English princesses for almost sixty years or so).
If they continue pursuing a Breton match then war with France is inevitable (Francis II was determined to maintain Breton independence in the event of his daughter being his heir - an English or Austrian/Burgundian match is the most obvious way of doing that).
If England succeeds in marrying the Breton heir then maintaining her duchy is going to set up virtual permanent war with France over the next few decades - France's ambitions in Italy means England gets tied alongside Spain and the Empire in that conflict too.
The cost of the Italian wars was a major need for the papacy to increase its income and that alongside other things was a factor in growing dissatisfaction and distrust of the Church particularly in northern Europe.
England's trade was very dependent on areas that did become heavily influenced by reforming voices so you can't rule out a bottom down reformation (as happened in Scotland for example). A future Edward VI or VII or Richard III or IV - perhaps having received an excellent education and married to a reform minded consort might well see the advantages that Henry VIII did and slowly move to reform.
The early Tudor court was very much like the Yorkist court - much of Henry VII's administration was similar to that of Edward IV's - who had started the process of tying the country gentry more to the crown and the court (giving them more say in their localities etc) than in the past when their access relied on their relationship with their local major aristocratic landowner (in effect these were the new men who dominated England in the 16th century)
Here's a rough direct line and the events it impacted
Edward IV (1461 to 1492) m Elizabeth Woodville
Edward V (1492 to 1527) m Anne Duchess of Brittany
Edward VI (1527 to 1548) m Margaret of Anjouleme
Richard III (1548 to 1568) m 1) Elizabeth of Scotland 2) Eleanor of Brabant
Notes:
Edward IV survived his illness in 1483 to reign until his death in 1492.
The success of his marital adventures saw his children on many thrones across Europe.
His daughter Elizabeth became the second wife of the Emperor Maximillian, Cecily became the wife of James IV of Scotland, Anne married Philip the Fair and Catherine married Juan Prince of The Asturias in a series of anti-French marital alliances in the late 1480s.
After a brief war Edward Prince of Wales was married to Anne of Brittany (who bore her husband two surviving children)
Edward V initially avoided conflict but long resentments with France and a close relationship with his brother in law Philip of Burgundy (now the Duke of Brabant) resulted in a general conflict prompted over the contested French, Austrian and Spanish claims in Italy which England joined - the papacy swapped sides to suit itself eventually allying with the French and a forced treaty supported by the Papacy saw English gains limited to retaining Calais, La Rochelle and Brittany and the King's son was forced to marry Margaret of Anjouleme - the failure of the war of 1509 and what the English saw as a pro-French papacy would have a lasting impact.
Edward VI's court became a centre of humanist and new learning in the 1530s due to the influence of the Queen. The Queen's humanism and the King's resentment and distrust of the Papacy in the 1520s saw a weakening of ties with Rome though the royal couple remained traditional in their relationship with the church. However greater demands for reform were made and the King intervened to limit the church's attacks on heretics in his later reign. The Papal representative described London with its strong ties to merchants in the Netherlands and Germany as a "veritable brothel of Lutherans, heretics and others that the King and Bishop do allow to roam and preach free from all harm"
Richard III was largely educated by Thomas Crammer (he began life as an Oxford cleric before being appointed to chaplain to Queen Margaret rapidly rising to become first Bishop of London, then Lord Chancellor and Archbishop of York by 1547) and he was much closer in view to the Protestant thinking emenating from Germany and the Low Countries. Crammer's influence on Richard III particularly his views on the Biblical authority of King's was largely blamed for England's final breach with Rome - In 1549 Crammer guided legislation through Parliament establishing Richard as Head of the Church in England. Further reforms in 1550-1555 dissolved the monastic institutions and abolished the Papal supremacy. His marriage to Elizabeth of Scotland daughter of James V (died 1554) was relatively happy despite the Queen's traditional Catholicism. Her death in childbirth in 1554 in midst of the Royal Supremacy row was seen as hardening Richard's attitude. In 1557 Richard remarried to Eleanor daughter of the Duke of Brabant - the new Protestant Queen proved a loyal supporter of her husband's religious policies and was a keen promoter of education.