got at this today lol, located the plug Rab mentioned above but it has no power when side lights are on, so i made an incision to the glowpanel + wire and then tapped into the side light wire before the rear light plug.
panel wouldn't light up, tested it and its getting power so pulled bulbs out and they are very very dim. Played about with it for a while then gave up baffled ??
using the mk1 loom from the panel back too