Do you usually give cash to both the Bride and Groom for a wedding in UK?

So I m unfamiliar of how weddings work in UK as I livein Asia. I will be flying in for a friend s wedding next week and plan on givng him cash (30 pounds). My question is, do you usually give money to both the Bride and Groom, or just to one. If to both, do you split the money you intended on giving them (in my... show more So I m unfamiliar of how weddings work in UK as I livein Asia. I will be flying in for a friend s wedding next week and plan on givng him cash (30 pounds).
My question is, do you usually give money to both the Bride and Groom, or just to one. If to both, do you split the money you intended on giving them (in my case 15 quid each) or do you give both of them the full amount?
My girlfriend is also invited, in which case would she also do the same?
Update: Edit : Thanks everyone. We'll be giving them a card with 50 pounds in it =)
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