Well the phpbb forum recommends www.bluehost.com so I had a look at thier website and it does look very competitive. I noticed a live chat box for support so thought I would test the support, and this was the conversation: (USA times)
FIRST TIME SALES QUESTION [5:10:31 PM]: Hello, do you offer support in the UK?
Ann A. [5:10:31 PM]: Thank you for contacting the Sales Team. Please give me a moment while I review your question.
Ann A. [5:11:13 PM]: Hi! we have many customers in the UK, and offer 24/7 tech support by chat. We also have phone support, but it's expensive for international customers. You can sign up online, the account sets up immediately.
[5:11:21 PM]: I can give you some urls hosted here, if you want to test the speed.
FIRST TIME SALES QUESTION [5:12:26 PM]: Im at work at the moment so wont be able to do a speed test, im just making enquiries atm.....can you recommend a suitable package to host a phpbb forum?
Ann A. [5:13:03 PM]: We offer one hosting package, shared Linux hosting. everything listed under Hosting Features is included. We offer one click install of phpbb3.
[5:13:05 PM]: Our hosting is prepaid, due at signup. We have 3, 6, 12, and 24 month plans. You can view our complete pricing list here: http://helpdesk.bluehost.com/kb/index.php?x=&mod_id=2&id=162
FIRST TIME SALES QUESTION [5:13:46 PM]: i will have a look, thank you very much for your help 
goodnight
Ann A. [5:16:11 PM]: You too, thank you!
So I'm pretty impressed so far, the list of features is amazing and we get enough space not just for our little forum, but for 100!!!! That will be plenty me thinks! Free domain, free email etc, and shit loads of other stuff for $6.95 a month....I think thats about £4 a month??? Definitely a serious contender!!