To make up for my idiocy on the H4 thread, I thought I'd post how I added an internal tailgate release in case it's any help to anyone else.
My tailgate has a fibreboard covering, don't know whether it was standard or whether the converters removed another panel and replaced it with this. Anyway, with that off you will see a little blue plug (unplugged in pic below). This is the two wires that need to be touched together to activate the release.
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I cut into each of these wires and soldered additional wires. The connections were then heatshrunk and plugged the connection back in.
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While I was at it, I put some Silentcoat on the inside of the hatch (took 7 sheets) as I noticed it had no insulation of any type. I also covered the back of the fibreboard with a layer of closed cell foam. I then got a boot release switch that I'd got off ebay (generic Ford switch, was about £6) and measured and cut a hole so that it would fit through the fibreboard into the top of the spaces on the inside of the hatch above. This isn't quite central but I needed the depth for the backside of the switch.
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Connected up the switch and put the panel back and voila, I have an internal tailgate release.
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It can't be knocked open by a load (not that there would be anything resting on mine anyway) as the actual microswitch is an upward press behind a membrane inside the handle.
I'm probably going to cover the fibreboard with vinyl or something and I'm going to fix hooks to it so that I can bungee traction mats and levelling ramps to it, which will fit neatly in the spaces between the tailgate and the furniture. Anyway, hope this helps, not a tricky job at all.