for my diesel mondeo with Fully synthetic oil I was quoted £96 for a basic service (this includes oil and filter, fuel filter change and check of gear box oil) and £125 for a full service (in addition to the above items they would change the air filter and pollen filter and check the brakes and steering fluid levels
I went to motorworld, got all the consumables and did the work of a full service for about £80. took me about 2 hrs and a few favours to get the oil filter cover off.
do it yourself. its not hard.