Years ago, when I built my workshop at the bottom of the garden 20m from
the house, I put an unscreened 25 way multicore cable (16/0.2mm) for
future expansion.
Now I would like to extend the computer network down there and there is
no way to get an ethernet cable down the same duct.

I have a number of space cores in the multiway but they are not twisted
pairs. Do I have any chance of getting a few mb/s bandwidth down that
cable? This would be for file transfer, emails and light browsing
The other occupants of the cable carry either DC or phone line or are
floating.

I'm currently using homeplug units but the performance varies from OK to
unusable from day to day, hour to hour.
Too far for standard wifi.

TIA

Bob