You need to provide more details:
What size rad,
How far it needs to be moved,
Are the pipes run on the surface or inside the wall,
Where about in the country are you,
Will it be a one visit job or is it working around other trades i.e. multiple visits.
There are a lot of factors involved, so it is not possible to give a fixed or even rough price. I could say £10k and it does not matter how far it needs to be moved, where you are in the country etc because I know I can't loose