Well a big thanks to
BlackFR and
joonspoon for posting up details of
how to do this.
Project Gabi is complete!
Turned out that the reason the boot light was out of stock was because it has changed its part number to 7L6947101A (made in Poland). New part was in stock so everything arrived at dealers on Friday and I collected them this morning.
I understand now what the housings are all about. The wires only have bare crimps on them and so you have to insert them into the housings. Each housing then becomes a plug that goes into the corresponding socket on the light fittings and switch.
I took the live feed from the interior light as BlackFR suggested and I found that all I needed to do was unscrew the passenger sunvisor from the headlining, pull away the rubber door seal and the end panel from the dashboard. The wire then just tucks under the headlining and down behind the door pillar trim.
I didn't need to remove the glovebox, but did remove the plastic shelf underneath it in order to get my hand up from the footwell and clip the glovebox switch in place.
I added a blade fuse to the live wire and used the connector for this as a convenient way of connecting another wire to carry power to the boot light. The fuse isn't really needed as the interior lighting circuit is already fused, but it can't do any harm.
Unlike joonspoon, I opted to switch the negative wire for the glovebox light rather than the positive. Same end result, but it's the way most car interior lighting circuits work.
Tucked a wire along behind the trim at the bottom of the passenger door frame and the rear panel and into the boot. Connected up the negitive to the wire on the pink connector as
BlackFR said, and hey presto!
Everything seems to be working OK. Hope the car starts later, got to be in Cardiff at 9:15 for a training course!