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@stem thank you - seems the new installation should be simple. I went ahead and bought a 'new old stock' item through an eBay seller which arrived promptly and I've tried to install today. However, I didn't get past fitting the batteries because it's arrived broken. The seller issued a refund...

I think you may be correct about the third (Grey) wire being part of the fixed thermostat. There is a Brown > 1 and a Black > 3 but also a Grey to 3 (though this could be part of the thermostat). Based on this, when my MPRT arrives I’ll replicate the positions of the Brown and Black wires to...

@Johnmdc Thank you - I think I've reached a satisfactory outcome following the advice from stem @stem - I will be ordering a 'new' battery powered MPRTto replace the fixed thermostat. When it comes, which wires should I be putting where to get the desired outcome for the upstairs zone? I have...

@Johnmdc Digging behind the MEP2c I couldn't find a spare brown wire as such but did observe a block connector joining two together as pictured: An overview of the Joint Box area is below: Close-up inside the joint box below: Note wires lead to the following components (starting...

Hi Stem - of the two suggestions, I prefer Option 2. I'm not attracted to Option 1 at all because I like having zones even if the hard on-off is a frustration. Can I suggest a 3rd Option though where I replace the upstairs stat with a programmable stat - would this be a practical solution albeit...

Stem - thanks for your continued assistance, I got back later than expected today but tried your suggestion and have some more information for you. Before I begin, the photo below shows the current configuration of the MEP2c now Hot Water is controlled correctly by the 'Hot Water' side...

Stem - your re-wiring advice for the MEP2c has worked a treat. Removing the brown wire linking L and 3 then moving Black from 4 to 3 means my Hot Water is now operating from the 'Hot Water' side of the box and my OCD can relax a little! Thank you so much! The heating zones appear to be...

Thanks Stem - I'll try that and report back later. You did read that right - the upstairs heating is available 24/7 regardless of programmer on times (it is crazy so I am in a constant battle with my wife over the stat setting!). The upstairs MRT1 has the following connections: BROWN > 1 BLACK...

Thank you both for your responses. Old & Bold - yes, I do need the programmable stat for downstairs. This MEP2c does not currently have any influence over heating whatsoever. Just the Hot Water timing alas from the ‘Heating’ side. The last owner did just live with it and I may need a pro in to...

Hi RGM - thanks for your reply. Below is a (hopefully) better photo of the wiring: Ultimately - Yes, one of the Brown cables goes direct from L > 3 (the 5th cable from left as you look at the photo). All others come from behind the wall... Now this is clarified, could you expand on why this...

Hi All - first time poster so would be grateful for your thoughts on this. I've just moved into a 2011 property with a Myson MEP2c dual channel programmer. There are 2-zones to the heating; upstairs (operated by a Myson MRT1 thermostat) and downstairs (operated by a Myson MPRT programmable...