Just use localbitcoins someone near you it is bound to have some bitcoins he wants to get rid of, you can buy as much as you want and there are many payments options.
Ok, this is definitely an option, but know the risks before you set up a meet and greet to buy bitcoins from someone who lives near you.
First, people have gotten robbed, even killed trying to do this. Now, those scenarios involve larger sums worth stealing but it's tough to meet a stranger to exchange cash. It's real easy to for someone to show up with a gun, well not in the UK as much...a knife I suppose. But from what I see on the news UK criminals know how use a knife!
Second (and perhaps most important), make sure you're getting a fair exchange rate. Don't pay a premium for the perceived convenience of "local bitcoin". Pull out your phone in the parking lot, where ever you meet someone, and look up the list price at that moment. Use Coindesk as a neutral quote.
Godspeed, friend!