The telescopic fitting "B" leaks, despite various efforts at bodging it, an d needs replacing with something. The nasty bodge "A" also needs doing prop erly. Pipe "E" rises out of a concrete floor and is already quite short so I don't want to mess with it too much for fear of ending up having to repla ce a buried pipe.
My thought had been to cap off the top of T fitting "D", put a compression T fitting in pipe "F" and then bring a pipe from that up and around (throug h 90 degrees) into the radiator using a straight valve. My worry is that th ere might not be enough movement in pipe "F" to allow the T fitting in. Hop e this makes sense.
Any bright ideas please?