Brompton owners

Yo everybody

I need another chainset at some point, can't be bothered waiting for the newer Brompton one to be available as spares, especially since it involves changing the BB too (ISO/JIS compatibility)
Would this work on a Brompton?
http://www.ebay.co.uk/itm/Sram-truvativ-GXP-compact-road-bike-crankset-chainset-NEW-genuine-/261412906660?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item3cdd6c66a4http://rover.ebay.com/roverimp/1/710-53481-19255-0/1?pub=5574889051&toolid=10001&campid=5336525415&mpt=[CACHEBUSTER]http://rover.ebay.com/roverimp/1/710-53481-19255-0/1?ff3=2&pub=5574889051&toolid=10001&campid=5336525415&item=261412906660&mpt=5157924
What (cheap as possible) BB can I use it with, and would I need a BB shel spacer somewhere?

Yo!

Loic

Anybody else could kindly comment please?

Ta babes!