Some final pictures of work. Fitted two radiators in loft, a lot of pipe run had already been carried out and pressure tested. I choose a stylish horizontal radiator. Most of pipe run is in copper, it is run in 22mm to the unequal 'T'. The 15mm white speedfit pipe supplies the other radiator on opposite side of room, choose plastic here as it was in one length with no joints under the floor. This is the other radiator, joints made using compression fittings, then carried n copper. Using pressure test pump to check for any leaks.The valves were shut of on bath radiators so only water in the pipes would be tested. System pressure at 5 bar. Left for 10-15 minutes and no drop with in that time. checked over joints and all seem fine. Pipe work insulated using insulation. Used elbow valves to make things look neater.