The only thing you will have problems with with most ISP's these days is "Unlimited Downloads"
What size of downloads in GB are you expecting to do over a month.
I am with Plus.Net > click here < who I would recommend. They have a fair usage policy in place, and GB limits on accounts. But only during peak hours, off peak downloads do not count towards any limits they impose.
I play online games for which they seem excellent, always get good pings to UK servers, and their support is based in Sheffield.
They also do 1 month contracts so if you don't like it you're not tied down.
P.S. If you do go with plusnet, my Id for referral is RCCLTD