Welcome to the forum David,
You'll find the members on here are a friendly and helpful bunch :)
Sorry to hear of your situation, and I have to agree with Tom on this. I would argue that if it was fuel contamination then they should be replacing all the fuel lines as well but the fact they are not on the bill I find odd. I used to work at a Volkswagen service department and you had to change the fuel lines, hoses, pumps and everything except the tank.
The bill sounds about right and any trusted garage who know you should be happy with you to buy the parts independently.
Sorry I can't help more
Cheers
Steve