When I was in the UK I used Blaster Devil BB's... Those were pretty good IMO, no jamming and offered at a pretty decent price; 8 quid for 3000 ct of .25's.
Zero One BB's were also pretty good and fairly cheap at 10 quid for 5000 ct bag of 25's. I think these are likely Airsoft Elite rebrands but I can't confirm.
Green Devil Bio's are pretty good supposedly but I've never tried them. I think those are from Denmark or something.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE