It’s because some bright spark wants to build a new housing estate over the top of a mains gas pipeline, 900mm bore and 80 psi I believe. They have to give it 15 m spacing or so, either side, but I think it won’t go ahead for obvious reasons. Remembered from my time in the RAF, we had to avoid the inspection routes if we were low level, just thought a bit more ammo against the planners. The helos could hardly do inspections over a built up area, esp single-engined, 1000 agl min over built up I’ve been told.
Thanks for for the input folks.