I was having a look at a seized on british gas trv at my father in laws house. Had a towel wrapped around it and manly attempts in excess of a jam jar lid tightness to no avail. I have decided to replace the unit itself. Does anyone know where i can buy the complete valve assembly, i only want to replace the air sense part of the trv to save me the hassle of draining the system and it looks as if british gas have made them thier own so no easy swap for a danfoss!