WI Lancastrians win Battle of Northampton in 1460?

On 10 July 1460 Lancastrian and Yorkist armies clashed near Northampton. When Warwick reached the Lancastrian right flank, commanded by Lord Grey of Ruthin, treachery ensued. Grey had his men lay down their weapons and simply allow the Yorkists to have easy access into the camp beyond.
This proved a fatal blow to the loyal Lancastrians: after this, the battle lasted a mere thirty minutes. The defenders, unable to manoeuvre inside the fortifications, fled the field as their line was rolled up by attacking Yorkists.
The Duke of Buckingham, the Earl of Shrewsbury and Lords Egremont and Beaumont all died trying to save Henry from the Yorkists closing on his tent.
Three hundred Lancastrians were slain in the battle, the King was captured and once more became a puppet in the hands of the Yorkists.
WI Lord Grey doesnt betray Lancastrians and they win the battle?
How is a victorious Henry VI alters History? Any thoughts?
 
He seems to have been unfortunately healthy in body but not in mind, so he'll probably live at least another 20 years. Despite the existence of an heir, he won't be old enough to take the Regency into his own hands for another 10 years or so, so if Henry has another one of his mental turns then all Hell could break loose again.

The scenario immediately begs the question what of Edward of York and his brothers, would they be reconciled to Henry VI or would they be exiled or tried for treason *(a bit difficult with George and Richard as they are still boys)

Letting them live would create the same kind of problems if Henry goes mentally wobbly as
 
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