I think your plumber just doesn't want to fit them. Does he work on his own or have others helping him? If he's on his own this may explain it, he doesn't want to move them by himself (and can't ask you as the customer for help as if he does and you're injured helping him you can sue him...
Is it true that cast iron radiator need half-inch pipe instead of three quarter inch required for press steel radiators? I’ve been told that the radiators are linked on a loop and that if I have the cast iron ones fitted the last one in the loop won’t work.
Is the plumber just trying to get...