I have recently moved into a bungalow in which the radiator response seems "sluggish" By this, I mean that when the heating fires up, everything gets nice and warm but when the pump stops, the thermostat is slow to respond to the temperature fall. The stat is a Honeywell T6360B with the live feed to terminal 1 and call to terminal 3. The wiring diagram shows a neutral connection to terminal 2 but this has not been used. However there are two black conductors available, presumably the neutral to the live feed and the call. These are joined by a connector and are in the box behind the stat. Before I use these to make terminal 2 connection, am I missing anything? The system is pumped hot water and central heating using a Honeywell 4073 3 way valve and of course a cylinder stat. Any help or suggestions gratefully received just in case I am missing something obvious.