Where to get a 2451 serviced?

Hi,

I've been meaning to get my 2451 serviced for some time, does anyone have any recommendations in the UK? I tried Swiss Time Services, but they won't do 321 movements it seems. The watch runs, but could keep better time.

I'd also quite like to get some laser welding done on the case (18k) if anyone has any recommendations for that too.

Thanks

John