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[amba]

So I need 4 wires..the existing Blue N and Brown L are in correct place I need to check with a meter if the Yellow/Green is switched .if so I connect that to the new backplate position 3 .I then need to put a 4th wire to the position 1??but what does that connect to??you say a live feed so is that just a straight live

[Lioned]

http://www.invensyscontrolseurope.com/NR/rdonlyres/8BE57B7E-B03A-4C95-B415-79DAF6208D8F/7546/090793_A.pdf

Is this what you have amba ?

You need to be sure that the green/yellow is going to the motorised valve (either directly or through the junction box).
You can just 'jump' the terminals with a bit of wire from the live to terminal 1.

If you have a wiring unit/junction box somewhere (possibly in airing cpbd or next to boiler why dont you put the receiver there and just make safe the wires sticking out the wall where your old stat is ? Or better still trace them back and disconnect them.

[ballcock50]

If you existing r.stat has a neutral wire (blue) then you can fit the rf stat easily first check with a multi meter that the earth cable (green/yellow) is being used as a switched live for the motorised valve. disconect the plug for the heating control or switch off the fused spur, using the continuity setting on the multi meter see if there is continuity from red to gr/ye with the existing rstat turned down (should not be) then turn to max position this should give continuity. The new rf stat then should be wired with the live neutral to their respective terminals a live link to the common on the switch terminal and the gr/ye to the call for heat terminal. but sleeve the gr/ye cable with some red tape for future ref.

[Marks DTM Calib]

So I need 4 wires..the existing Blue N and Brown L are in correct place I need to check with a meter if the Yellow/Green is switched .if so I connect that to the new backplate position 3 .I then need to put a 4th wire to the position 1??but what does that connect to??you say a live feed so is that just a straight live

Because the model you have need a short jumper wire from the Live connection to pin 3......as this is an isolated relay setup.....aso the relay common does not have a live feed by default.