> Without Bletchley Park and the massive advances in electromechanical computing that Turing helped to spearhead, the world would probably look very different today.

That's an unnecessary exaggeration. ULTRA was incredibly helpful to the Allies, but there is little reason to believe that without it the world "would probably look very different today". In all likelihood the worst scenario is that the war would've ended a bit later, and with somewhat more favourable conditions for the USSR in terms of their positions in Europe.