I live on first floor of block of flats and don't have my own boiler but share a communal one for heating only. Hot water comes from my own immersion heater.Two radiators don't heat properly, heat is patchy but better at top, bottom sometimes is completely cold, sometimes hot. Engineer says its a problem with communal heating and cant do anything. He grudgingly said he would order some new thermostatic valves but I think rads need flushing out. Any comments please, I pay a high service charge for this.