after having a new radiator fitted in the conservatory by someome out of the local paper,the feed was coming from a radiator directly next to the boiler it is only about 5 meters away to the new radiator anyways after he fitted it i noticed the radiator was not as hot as the rest so i bled a couple of times to satisfy myself ,he connected a 10mm flexi pipe from a 15mm pipe (copper ) i'm thinking should he have fitted a 15mm and should it improve also if i replace the pipe with flexi pipe do i really need to buy a plastic pipe cutter for one job ...regards will ...any suggestions welcome