Nickegg, I can’t really guarantee that the trails are going to escape unscathed, but the FC ranger is going to go up there with the contractors beforehand, talk them through where the trail is, and explain that they should avoid damaging it if possible.
Some bits of the trail may get a bit mashed where it’s crossed by the access tracks, but there are only a couple of places like this. I think they will also be putting down brash (small springy branches) to protect the bits that need to be crossed.
I hear you re the Weir Lane bit by the way, that’s definitely on the hit list for a future dig day…