Hello all
Yesterday I found a metal pipe running right across my garden, from one side to the other. I've only dug around about 6ft. of it, but it seems to be actually plumbed in somehow. It is metal, (iron or steel I suppose), about 25-30mm diameter, around 12-18" below the surface.

Does anyone have any ideas what it would be and what I can do about it? Redundant mains gas maybe? It is really in my way, as it is slap bang in the middle of a section I have been preparing to use as a herb / veg / fruit garden. I hadn't exactly decided what I was going to do with the ground but digging is going to be a problem with the position of the pipe.

I'm puzzled as I already dug up another L-shaped section of the same sort of pipe about 18'. It had a cylindrical concrete block on one end, but the whole piece came up without any problems. I'm starting to wonder if I am digging at the remains of an 'Anderson' (WWII Air Raid) shelter.