My MOG was this year in August for a service at Brands Hatch Morgans.
The service was (like it looks the usual) 400,-GBP plus changing all fluids plus some small bespoke work.
The bill was than 800GBP incl. VAT.
BHM is wellknown and I travel from Germany in this time to let my MOG service there.
Have a look here:
http://www.talkmorgan.com/ubbthreads.php/topics/399192/bhm#Post399192René