I'm always reluctant to suggest / recommend companies as most developers think the host they use is the best...
Having said that, I am also based in the UK and use a company called Fast2Host....I have been with them for a about 4-5 years now and have found them extremely helpful...It seems nothing is too much trouble for the guys there...I believe they are a reasonably small outfit in terms of employees, but they normally respond to a support ticket within 15 minutes...Usually it's a lot quicker than that.
They will provide help in all areas and they seem to be genuinely knowledgeable about servers, networking, hosting etc...Ie they're not one of these companies that rely on a customer interface to change settings and can go direct onto the servers to sort out any issues.
I can't comment on their financial position, but they have certainly been around for 4-5 years and seem to always be reinvesting in the hardware, software and packages available. I have seen numerous developments and expansion of services since I've been with them.
I do everything on my hosting with them. I have a reseller package, virtual server and purchase all my domains through them.
You should consider where the majority of users that use your application will be based. If they will be in the US, it may make sense to have a host in the US as the response times for US users would be much quicker.
If you want to use them:-
http://www.fast2host.com/client/aff.php?aff=008 this link will include my affiliate code for which I would receive a commission if you signed up to anything
Shared hosting - reseller hosting Windows or Linux - Fast2host use this link if you'd prefer not to use the affiliate one.
Hope that helps.
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