Looks about right, although probably best to check with Worcester direct rather than taking the word of some random bloke on a forum 
Also did spot this earlier tonight, seems that Salus do a range of ZigBee heating stuff now (I use some of their socket plugs which are pretty good).
Not sure it will work in HE as it depends what ZigBee clusters it supports, but it would be more akin to a normal "boiler receiver" type device if aesthetics are important (perhaps not as you'd mentioned it being in the loft).
