Two issues here.

(1) I would like to be able to access the wiring into the ceiling roses from
above for maintenance, but I also want to floor in the whole loft with T&G
loft panels. At the moment I can get at most of the wiring because the last
third of the loft isn't yet floored in, and the area where the cold water
tanks sat is also not floored in so I can slide T&G boards sideways to get
them out. However when the whole lot is done, the lighting wiring will be
concealed and getting at it could be a major operation.

(2) I really, really hate it when the ceiling rose has three or more sets of
wires coming into such a small space. Endless fiddling to get everything to
slide down for access, then slide back up again to refit the rose. Also
doing it perched on a set of steps looking up.

So I would like to do one of two things.

Either just put some kind of inspection hatch over each ceiling rose -
something low profile like a metal plate which can have stuff placed on it
when not being accessed - or bring the wiring up through the floor into some
kind of junction box so that each light fitting only has two wires and the
wiring is easily available on the loft floor.

Both solve problem (1) but the junction box is an obstruction/trip hazard so
although solving (2) it causes other problems.

How about fitting a dry wall box into the wooden floor and having some kind
of junction in there, with a blank face plate?
If so, what kind of junction?
Can you get blocks of connectors (something more sophisticated than choc
bloks) which are suitable, or even a proper junction box with strain relief
which will fit in a wall/floor box?

Cheers

Dave R