On 25/03/2017 12:03, F wrote:
It looks as though I'm going to have to thread a thin, so very flexible,
cable into the ceiling void from below and then out again a couple of
metres further across. I've used a straightened coat hanger in similar
circumstances before but the current stock won't straighten to the
required distance.

I can't get at it from above, but at least the joists run in the right
direction for me.

So what's the best way to do it?

Thanks for all the (inventive) suggestions to date!

I have a strong magnet that was used for cleaning the thick glass of an
aquarium so I'm liking that idea. Also the trunking lid suggestion.

I'll be avoiding the bare metal options just in case there's something
there that I'm not expecting. And fingers crossed there's no silly
obstacles on the way.

I just need to wait until Management is out of the house: if she sees me
poking holes in the ceiling...

--
F