Which makes me:
Hopeful - because it should be significantly less expensive to get a pipe replaced.
Annoyed - because the previous people told me I needed lots of water-proofing done - for £4000+VAT. So glad I got a second opinion.
Worried - because I queried dropping pressure with the boiler repair guy a year ago, and was told that it wasn't anything important and I could ignore it. And now, possibly, I'm going to have rotten wood under there...