I would say from my own personal experience that the best the Op can hope for is that Evans Halshaw contribute a small amount to him getting a rebuild or second hand engine as a good will gesture.
I bought a JDM Impreza WRX that went bang one month after I bought it ~ big end failure due to oil starvation after the oil pump failed. The seller although a registered car dealer had sold me the car from his home address with no warranty. After some advice from "citizens advice", letters back & forth to the seller, he eventually stumped up £500 towards the cost of my engine rebuild as a good will gesture.
Little consolation really as the engine rebuild cost me £4500 but then I did upgrade a few parts along the way for peace mind (uprated pistons/con-rods/oil pump etc).
Good luck and hope you do get a decent out come.