this is what it looks like now, as you can see i brushed on 50/50 pva.

http://tinypic.com/view.php?pic=31434ba&s=4

the back box sits deeper than the level of the wall surface, which
might make it harder to fill around it?

i've got a plasterer skimming a ceiling later he uses thistle multi
purpose stuff. should i ask him to tidy it up or have a go myself with
standard filler?

how do you mean the bonding plaster holds the back box? i need to
sort that out too, because it had a single nail in the centre but it
wont hold any more.

cheers