I use a really good hosting company called Dataflame but they suffer (as most hosts do) with problems helping thier clients.

I have recently found when I install Drupal 7 on some shared hosting it causes the site to trip mod_security and lock the user out. After some digging I found that this is caused by an old rule (2 year old rule 95004). I went and told  Dataflame  about this and they have told me they wont do anything about it! All they have to do is update mod_seurity for thier build.

Basically, this means I have to tell my clients not to use Dataflame because it will mean there brand new site wont work on it.

Thanks Dataflame

Now, does anyone know of a good UK host?