Plumber fitting new rads said in error the supplier gave him 600mm high rather than 450mm high. Due to the fact the rads are under a window hight is limited, 450mm was what he was supposed to get as he then had 150mm cap at the bottom between the bottom of rad and the floor, however he has just called me and said 'he was incorrectly supplied with 600mm', my gf let him in the house and he says he can fit them in at squeeze, there must only be max 10mm between bottom of rad and floor in this case. Is this just asking for trouble doing this having such a small gap ?