Sump repair / helicoil in Norwich

[Tc24]

At the time of it's last service, mechanic pointed out that the thread on Dad's B5.5 Passat TDI was stripped and that he'd need to consider getting it sorted at the next service. Turned out it needed seeing to sooner, so he plugged it with some DIY kit thing from Wilco.

Fast forward another 2 months and the bloody thing is dripping again. Usual garage can helicoil the sump, but they have somebody come in to do this which works out quite expensive. Is there anywhere in Norwich that has the facilities to do this and who won't charge a shedload?

Thanks in advance.

[Tc24]

All sorted - usual garage turned out to be best price even with having to get someone external to do it.