On Britain, it might be relevant to note some of Grey's statements to Cambon.
On 29July, Grey said "France is being drawn into a quarrel which is not hers, but in which, owing to her alliance [with Russia], her honor and interest obliged her to engage." But, he pointed out, Britain was "free of engagements", and "Our idea has always been to avoid being drawn into war over a Balkan question."
On 1Aug, after Cambon apparently mentioned Britain's support of France during the Agadir Crisis, Grey again pointed out that "in this case, France is being drawn into a quarrel which is not hers."
If Germany doesn't DOW France, but France enters the war anyway, Grey's objection against Britain being obligated to support France gains even more credibility, as it is now quite clear that France is not having war forced upon her.
So, yeah, no German DOW against France, + no German invasion of Belgium, probably = no British entry and no British blockade.
On 29July, Grey said "France is being drawn into a quarrel which is not hers, but in which, owing to her alliance [with Russia], her honor and interest obliged her to engage." But, he pointed out, Britain was "free of engagements", and "Our idea has always been to avoid being drawn into war over a Balkan question."
On 1Aug, after Cambon apparently mentioned Britain's support of France during the Agadir Crisis, Grey again pointed out that "in this case, France is being drawn into a quarrel which is not hers."
If Germany doesn't DOW France, but France enters the war anyway, Grey's objection against Britain being obligated to support France gains even more credibility, as it is now quite clear that France is not having war forced upon her.
So, yeah, no German DOW against France, + no German invasion of Belgium, probably = no British entry and no British blockade.