Thinking about this a bit more- maybe the boiler doesn't need to be anything special. If the remote roomstat operates a relay at the other end, all that needs doing is to identify the wire that would have gone to a wired stat, cut it and insert the relay in the gap. If you study the Y-plan wiring diagram you should be able to find it, but if you're not confident, it's a sparky job. Obviously keep the landlord in the picture. You can take the kit with you when you leave, just replace the relay with a connector.
I looked on the web but all the stuff I found only mentioned the roomstat (transmitter) end, you might be able to find more.
I have a W-plan system, the pump, diverter valve and junction boxes (aka strip connectors!) with the HW cylinder in the airing cupboard, the boiler downstairs. Your layout might be different.
