Yep, first make sure your APN is right for your UK TMO carrier (theres a list on this forum if you search, I dont remember offhand), in the US its wap.voicestream.com. If that doesnt work, to to options>advanced>applications and make sure you have all permissions set to allow. If that doesnt work, reset your firewall. If that doesnt work try the battery pull (dont have any real reason that might work but sometimes does). I had to fiddle around with my first opera install to get it to work, and frankly im not exactly sure why it finally decided to.
Old at Being Young,
Young at Being Old