I have only used Ocean Plymouth for an MOT so far. No knowledge of Ocean Falmouth except for the fact that their service prices rank amongst the most expensive (they obviously feel that they have the market cornered down there...). Ring around come service time - you will be amazed at how much they vary for something like an Insp I or II - we're talking £££s!
Up until now Westerly Yeovil have serviced mine and done a few warranty jobs whilst i lived there for a year or so. They were pretty good other than washing the car just after i had had it detailed and had expressly asked them not to... I only get the main dealers to do the servicing as my car is still under warranty.
Other than that, Simpson Motorsport have done the majority of aftermarket performance tuning work on the car - top boys!