Continental Cars in Tufnell Park (near Archway) are very good. They used to be an official dealer, however since that was pulled, they are a "specialist" now - and they all the tools and computers of the Fiat dealers.

Quoted me £352 labour plus parts to change my cambelt on the HGT - which is not cheap I know, but helluva lot cheaper than other places

Also are open Saturdays to do some work - which is more than I can say for Fiat dealers, and you can speak to the mechanics - which is a godsend for enthusiasts like us who want to know what REALLY is happening with our cars!

They have a website - www.continentalcars.net

good luck!