"in-wall single gang back box onto which the Openreach faceplate can be refitted."
The electrician will be capable of it, but I need to have whatever he needs here for him arriving. Would you be able to suggest what I need to buy?
25mm SINGLE METAL BACK BOX -1 GANG WALL PATTRESS UK- FLUSH MOUNT: Amazon.co.uk: DIY & Tools
Is that what you mean, which I just understand to be a normal back box?
Genuine OpenReach BT Master Socket NTE5C + VDSL MK4 New 2016 Faceplate BNIB | eBay
Would I then get something like that and discard the plastic surface mounted back box?
Edit : Looking again at what I have.... I realise the ebay link is the current 2017 version but what I have would seem to be an extremely grotty surface mounted back box and on top of that a reasonably clean two part assembly thing, one of which I shouldn't be replacing. Meaning I'd only need a metal in wall back box, and I could just stick everything else into the back box and have it as neatly mounted as is possible?
Edit : There seems to be 3 parts to it...
* Back box
* Master socket
* Filter
My picture seems to show that the master socket and filter are fine, and it's the back box that isn't. I could do what I originally intended to, but thought I couldn't which is get rid of the back box and have it set into the wall, and while I wouldn't have a flush socket I'd at least have it only sticking partly out compared to the abomination I currently have.
I don't need anything other than a standard back box, and the electrician can sort it out. Although for the sake of £13 I may as well get the ebay thing as a backup in case he wants it or in case it's better.
I think I have my head around it now!