Speaker cable in wall

[MisterMoseley]

Evening all
Planning ahead for the (hopeful) build of a small extension which will probably house a half decent amp/receiver and some stand-mount speakers. Will end up being my second, rather than main, system.
The walls will be plasterboard (dot/dab) over block and I/d like to take the opportunity of running speaker cable inside (the PB).
Any obvious dos/dont’s?
Assuming that speaker cable doesn’t have to be rated for in-wall use or am I completely wrong about this?
Best to terminate with some sort of back box and face plate?
Sensible to use the same cable in wall and from wall plate to speaker terminals?
Thanks