My phone was constantly restarting and some research on the inet suggested it needed a new motherboard.
Sent my phone in by recorded delivery had to pay £5.50 to get insurance to cover the cost of the phone but nm.
SBE received it the next working day (7th) and I checked the progress the day after at:
SBE fault: None
Customer fault: Software (network services)
Or similar and something about repair finished send back to user.
So I phoned them using 01233 619320 to avoid the 0870 number (www.saynoto0870.com) and said that this wouldn't fix the problem and I'd have to pay to send it back to them so they agreed to hold it and said something about submersion testing (no me either) which they said was just longer testing.
A few days later the progress had changed to on hold with team leader. Finally I received a brand new phone today on the 17th. So its taken 10 days but I've got a new phone.
So basically check on their site and phone em and they'll do a proper test and fix your phone properly.