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The Drayton valve ended up requiring shorter pipes to it than my existing Switchmast VA1 valve - so I drained the system (does take quite a while), removed the valve, removed old olives and nuts, cut back two pipes (bent the third into position - I know but it worked) and then reattached new...

Thanks Chris for your prompt reply - works a treat. Thanks

I've just (literally 5 mins ago - and what a nightmare) managed to plumb in the Drayton valve - now looking at the wiring and assume it follows the same principle as Ollski stated as detailed below for a Honeywell. S/M h/well white----------------->grey blue------------------>blue Red...