Dunno what level of damage/work your compo was for, but I am still dealing with the damge caused from a massive sewer put through in the early 70s. The last 25 years, it has been "set-aside" of one sort or another! The area still can't be farmed as the soil structure is totalled. I might try again as BPS goes...We had a big gas pipeline put through the middle of the farm in the 60's, followed by Wessex Water in the 1980's (That was also Docwra). The water pipe was then relined in about 2012 the contractor was Daniels.
I can only echo all of the advice given above. Don't give them even a millimetre. Get the smoothest slickest most ruthless agent possible to work for you, it helps if several of you along the pipeline have the same guy, and through them claim every thing you possibly can, and don't be kind with your rates.
The compo from our last encounter bought our KV TineSeeder!