Owning your own home

Historic woodworm is just that. Historic. The holes are where the lava have burrowed out and flown away
If the timber is not damp they will not survive.

The damp specialist will invariably find multiple areas of "damp" likely by sticking a moisture probe into the plaster - which are designed to measure moisture content in timber so the readings are meaningless. They will then tell you it needs an injected damp course (which doesn't work).

The suggestions from the surveyor on dealing with any damp are much more sensible.

I would tell the vendor about all 3 but concede that you will ignore the damp and woodworm but that they should give you a reduction for the roof (as that will need doing). Conceding the other 2 items makes you seem reasonable and I think you are more likely to get them to reduce the price if you don't try and chip them on everything.