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Finally, to bring this to a close. A new actuator fixed it. Thanks to everyone above for leading me along the path of knowledge and heating...

Nothing like answering my own questions, is there?! More research on the net has revealed that the Drayton equivalent part no for the actuator is 27653, for use with a Drayton ZA6/779- 2 zone valve.

Sorry - more info and questions. Once unlocked, black lever moved gently across under finger pressure with slight whirring noise, the gears presumably. Pump then started up, but boiler didn't. Cold water being pumped. Let go of black lever, slowly returned to original position. Possible to...

Thanks.

Should the lever move easily? Seems pretty tight (sprung?) and reluctant to do more than move a few millimetres. Nothing to break if I give it a bean or two?

Right - this is useful stuff. Thank you. When the wireless stat is operated the red LED flashes the prescribed 7 times which confirms it is receiving a signal. Red then goes out, and as green lights there is a click from the receiver. Picture below shows the layout. I assume the blue...

Heating is not coming on, though radio receiver from thermostat is showing green light for heating demand, and boiler runs OK to provide hot water. So I was going to remove the bleed screw from the centre of the pump (Grundfoss UP 100 rebadged by British Gas) and check circulator had not seized...

I thought this was an isolating valve, there being another on the other side of the CH circulating pump, but I've not seen this style before (fitted by British Gas). Is it? As promised in FAQ, the moment I moved it in either direction it started to spray water. Luckily it stopped doing so when...