If your looking for the best price PAYG go for tescos! Pop into a tescos store when ya get here and pick up a sim for 99p

They have the cheapest rates out of all the main carriers. You could even sign up to their unlimited play, which is a 30 day rolling contract and for £30 you will get unlimted calls, texts and internet! How can ya beat that!

Oh and tecos use the 02 network so no need to worry about coverage.

I'd go with o2 as its the best deal.

you can check here it seems pretty good ; )

http://www.webmap.o2.co.uk