On 10/12/16 11:48, Chris Green wrote:
I had to cut some (mains lighting) wires to diagnose a light that
wasn't working. (Turned out to be a failed wire running up from a
switch in a conduit, can't replace for the moment).

So I need to reconnect a few wires in addition to making the new
connection so the light will work again. This is all under floor
wiring sitting between the joists. I'm going to crimp the wires back
together where I have cut them, what further protection do the
connections need? Would heatshrink over the whole thing be acceptable
or should it be in a box of some sort? A box would seem to be
overkill to me, might as well use a junction box instead of the
crimps.

no protection needed if there are no bare bits.
heatshrink more than enough