The British Army's full-time strength on 1 Aug 14 was 247,798 all ranks; of which 46% was serving overseas and not earmarked, initially at least, for the British Expeditionary Force. Figures from Call to Arms by Charles Messenger.
The original BEF itself (which deployed between Aug-Sep 14) consisted of the six infantry divisions (1-6) based in the British Isles, plus the Cavalry Division, 19 Infantry Brigade and those on the LoC and the Base Area. A back of the fag packet calculation puts it at just over 120,000, a significant proportion of which were recalled Regular Reservists.
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@par avion too!
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