By the way, regarding the flapper mod with switch.

The wires run down the passenger side on RHD. Don't come anywhere near our fuse box. The wire just comes out of firewall behind glovebox and then runs in the loom down the a-pillar behind the left kickpanel and then along the inside of car then to the pump under the back left guard.

In the engine bay you can also access it easily from the main 14pin connector next to the battery (under the air intake snorkel), but you would then have to run your switch wires through the firewall.

Just a matter of selecting the correct coloured wire as per US instructions, which looks quite thick (heavy duty wire).

Use the 87F terminal on the fuse box to power the switch but make sure you put a small rated fuse into the new switch circuit as the screw terminals are only fused with one of those 40 or 50 amp fuses on top of the battery at the moment. (All those bolts are "unfused" except for the large ones on the battery, so way too high for any added circuits inside the car).