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I've carefully scraped some of the paint off - and you're correct - it's yellow rather than yellow/green.

here's a photo of it: The Heatmiser PRT info states that "Firstly, check that you have at least three wires (excluding the earth) behind your existing stat. If you have, the PRT is compatible." I take it i'm alright then? again - thanks for the help

You are quite right - i assumed the first connection was 1, the second 2, etc. (whereas it goes earth, 2, 3, 1, 5, 6). So it's actually: 2 - Blue 3 - Green/Yellow (although i'm not convinced this is earth) 1 - Red Thanks again

sorry to resurrect such an old thread (i stumbled on it whilst trying to find an answer on google). I've got a Honeywell T6360 Thermostat (it's similar to/the same as the T40) and i'm trying to work out if i can replace it with a Heatmiser PRT. The T40/T6360 has the following connections...