Wall plate speaker terminals:
The electronics catalogues (online as well) sell these wall plates as well - i bought some from CPC (formerly Farnell) and they are fine. Or you could do it yourself - these same suppliers do all sorts of binding posts and sockets. Match an existing blanking (ie, light switch & elec socket blanks) plate with a usable rear surface (some have bracing that gets in the way) to match you're present wall plates shape and finish if you wish.
Plasterboard:
Some people have no problems with the wiring sliding down the back of the plasterboard, but generally its the plasterboard side of things thats more of a mess and a hassle (depending on your walls contruction - dot dab, stub part, etc). If the cable gets stuck part way down towards the skirting, chances are its hit a horizontal stud and will need bedding through the plaster surface to get past it.
Plastering:
Be prepared to practice you're plastering, and if you haven't had that fun before - dont use the tube stuff on this scale (unles you only have a vey small area to fill), prepare the surface with watered down uPVA (1 in10 if i remember right), this allows sanding to a flat edge later on, otherwise it might keep cracking away at the outside edge as you sand, leaving a broken edge. Then use fastset or a similiar product for easy sanding and a nice finish. Not that i've had plenty of practice after just spending 12 months gutting and re-finishing a flat built in the 1800's or anything... ;-)
I've still got all this to do on my new build house - joy...
Mark.
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