Recommend UK computer repair company please

["Fundamentally yours" <national@xxxxxxxxxxxxxxx>]

I am looking to get my Mesh computer repaired.
It's past the warranty period.
I suspect overheating. Crashes occur which eventually lock out 
windows, and the rescue disk cant find a hard drive, but it always 
comes back after a period of shutdown. It is now worsening, non 
intensive activity seems to make it crash.

There seems to be trouble with Mesh normal repairs service, who have 
a page of complaints ending with links to Dell & HP.

Would appreciate a contact number/address for a reliable, competent 
repair service. Especially one that provides a home visit.

Thanks.