So I asked Gail if she could possibly call 0800 281 279 and explain that her dog had been suddenly overcome by an urge to excavate some earth close to this notice, and check with Ineos FPS that this was OK with them?
I suggested she insist on speaking directly to the Ineos CEO Jim Ratcliffe (incidentally Britain's richest man) as I understand he likes to keep a tight rein on all major decisions in his company.
I was most hurt when all Gail said was: "Bertie, stop being ridiculous".