I guess you have detached it from the pump ok but it wont "move about" easily?
Sounds like its been trapped between the tank and the body, the pipes would have been renewed by LR under a recall, years ago. The LR dealer probably did the job in a hurry and trapped the pipe.
When I dropped my tank recently I found one of the pipes almost squashed flat, another had been "repaired" with a piece of rubber and a pipe clamp.
If you want to free the pipe you may have to drop the tank, but if you cant see any signs of leaks I probably wouldnt bother.
Mark