Let's take a BAOR PoD as UK Chiefs' Global Strategy Review, 15/7/52: Minsters had locked them away until they produced consensus, which was Massive Retaliation. US, too, adopted that as New Look, 30/10/53. NATO too, MC48, 19/12/54.
PM Attlee hoped to arm atomically with Lend/Lease Redux, loan Mk.5, but that option had been skewered by 1950 spy scandals. PM WSC funded Red Beard R&D, 7/52, Blue Danube production, 2/53, and the Bombers to deliver them. He, so easily, could have done what everybody else did: leave AW grotesque expense to US and assign all Defence Budget to warmware and iron.
Sov meddling caused 99 French Communist MPs to skewer 27/5/52 European Defence Community Treaty: the issue was rearming W.Germany: obvs. not with AW, but with (too) many fit young men. To overcome France's (logical) objection UK committed to (though never achieving) an 80,000 strong BAOR (a number , no core logic), to remind the new Bundeswehr to face the Elbe, not the Channel: “If (France is) to go to bed with the German tiger (it is essential Brits be) the bolster down the middle of the bed” E.Fursdon,EDC, a Hist, Palgrave, 1980,P243. All that caused UK Defence 51/52 to be 9.8%/GDP.
That dramatic uplift over newly-Allied FRG and Japan (1% by Law) was a factor in UK overstretch/decline if you wish.
UK could have done...no BAOR (well, who would be the bolster in the bed?); or no AW; or no East of Suez. Or not much Atlantic convoy protection; or...or. Any of those at, say 5% GDP during Korea, falling later, would have led to... a different world.