Hiya
If it helps i could scan and send a copy of my invoice for the engine change on mine.
It doesn't have the exact amount of hours, but it details the engine change, along with the Fault finding work, timing cover removal, etc. It has it as a Menu Subtotal price Showing my 70% contribution and it is detailed at £713.93 + Vat
It had no Full dealer history (but a full history at a local garage) and the car was out of warranty by 9 months. I bought it at 3 years old from a specialist. I put it to the dealer for a service (as i have used them before and have always been happy with their service) and signed up for a service plan covering the next two services (saved me £100), before they found the fault. This may have helped me, i don't know.
I'm not back to work till Monday if you want a copy

It might help

Sandy