Find a trustworthy independant garage and have a full service on your car for around £70, AND probably get a better job done.
All this FDSH when re-selling is a bit of a nonsense, unless you change cars every couple of years.
A service is a 'healing process' for the wear and tear on your engine. The spark plugs get changed, the oil and it's filter get changed, and the air filter. Most get points changed as well. This is to allow the engine to run more efficiently.
An M.O.T is an examination of the basic roadworthiness of your vehicle, including emissions tesing, brakes, fluids, lights, electrics, in order that your car is basically deemed sound to be on the highway for another year.