If the visa clearly indiacte that it's mulitple then it's ok.you can travel to UK. they are will not be any problems but make sure you bye a return ticket.some air lines might not accept you if you don't have a return ticket. and make sure your passport is valid more than six months from date of travel.

P.s. i strongly suggest that you buy a return CONFIRMED ticket.

with all due respect if i were you i would choose british airways as the air line .simply because they are national carrir for UK.

i'm sure the information might help you a lot.if have more questions related to visa i will be able to help you out ..