I am currently undertaking a bathroom swap at home I am going to do the joinery aspects myself(new floor, wall and backerboard), but wish to know how much I could expect to pay a plumber to rip out old toilet, basin and shower with enclosure, move and repipe a radiator move position of toilet including drilling 4"core and alter position of feed pipe, then fit new basin, toilet and walkin shower cubicle? I will be exposing all pipework as I am ripping up old chipboard floor. All advice and suggestions will be greatly appreciated. Radiator fed from combi system. Thankyou

You have to go different different plumbers. Check all plumbers rate list after that decide in your own rate and deal with low rate plumber.

I think that there is some problem with your plumber. I suggest you to change the plumber. Try to set the best quality plumber so that their would be no problem with it.