Sorry @dale, I should have said in the title, it's the WW2 Anti-submarine boom at Shoeburyness, in Essex. The other side of the boom is MOD land, it's an old testing/firing range and there are lots of unexploded ordnance buried in the mud!
Thank you very much @SFTPhotography .
Yes @alfbranch , If I'm honest, I didn't see it at the time, I was only concentrating on the left hand side because that is where the colour is coming from. I did try to crop it that way but I lost too much detail. Even moving to the right a foot or two would have made the difference. Thank you and lesson learned.