I'm changing my Honeywell T6360B thermostat for a Salus RT310 but am struggling to understand how the Honeywell is currently wired. The Honeywell website states 1 = Live 2 = Neutral 3 = Switched Live but if you take a look at the attached photo the wiring doesn't match this. There is a brown sleeved black wire to 2 and nothing to 3. Would appreciate some advice! Thanks.