Hi,i want to change a radiator from a single to a double panel as my living room tends to be a bit chilly.problem is the pipes to the radiator valves come through the wall.so what i wanted to know is do plumbers,as a rule,leave enough pipe inside the wall to pull a bit through because the new valves will be about 25mm further away from the wall,or should i just leave well alone and put a jumper on instead.
