Hello, I would like to ask some people from UK (and not just those), if they know about some good hosting in UK. Things that I would like to be supported are mainly PHP 5.0 and MySQL databases (unlimited numbers would be good). I will be very thankful for any tips...

I just got a webfaction account which is available to the UK. It has unlimited postgresql and mysql databases. It has PHP 5.0 too. You can also have long running processes. I enabled sockets for instance and they allow you to do just about anything. :) The most basic plan is like 5.50 USD /month. Very affordable.

I use CS New Media's reseller hosting. They've been extremely reliable, and support has been top-notch.

Thank you very much, both of you, I have looked on their prices, features, etc. and we're now deciding with my friend which one will we choose.