Came back to the car this afternoon & noticed the wet stuff underneath.

Upon investigation it seems to be the return from the security valve where it does that sharp 180deg turn and a split in the outside of the turn. Can't pull the pipe back to gain some length to trim it and reattach as the plastic pipe it's attached to does not want to come back (I suspect that there is a y piece in line that the pressure reg plastic pipe joins into which is stopping it) and the hose clip is also going to be a fiddle to undo.
Access in this area is a real PITA.
Any recommendations on procedure welcome after much headscratching. Do I need to get rubber pipe from GSF or will other factors have suitable stuff off a reel?