Think I paid about 200 for moving a rad along a wall a bit a few years ago - seems a lot but took a couple of hours - They had to drain the system and refill etc copper is also not cheap. I have a guy who might do it if you need.
Moving pipework can be a can of worms... is it under/over floor, or inside/outside the wall?
I'm guessing you want soldered copper pipe with bent corners, or perhaps soldered corner pieces instead of bent corners? I'd spec that too as some cheap quotes might involve using compression fittings, etc.
I've posted on checkatrade, but would be curious if anyone else has had rads installed and what the rough cost is to give me a benchmark.
Also other than TVR valves are there any other random expenses that I don't know about?
Cheers.
Actual job:
Dinning Room (ground floor)
a. Remove existing radiator
b. Move pipework 0.5m to other wall
c. install new radiator
install new radiator where there wasn't one