DONT go to Jam sport, heard bad stories from 2 people i know well
Including them swapping my mates 15000 mile old head for a head from a car made over 4 1/2 years earlier, then lied about it, then later admitted it and made excuse after excuse.
Jacked the car up on the front cross member, causing damage to it
Scratched his bonnet, then denied it was them, although it was perfect before they touched it.
Also many, cross threaded/loose/missing bolts in the engine bay