moving into new house and was decorating (radiators and hot water working) i bumped into a radiator and then noticed a leak on the pipe going in to the radiator (at the bit where you can choose what heat setting you want 1,2,3,4 etc) was quite a bit leak not just a drip the water was sort of flowing down the pipe anyway i turned the inlet pipe off and then to be safe the boiler off, took an hour to fix leak, but when i turned the boiler back on, it is giving hot water (sort off) but all the radiators are staying cold?? any ideas thanks