Before I get too excited...
Big puddle of LHM dripping slowly (as in very) from the centre crossbeam below the engine. Much more towards the scuttle than the radiator. Please don't anyone mention 8 limbed aquatic creatures...
Rear nearside footwell full of water - seems to be because the door doesn't come close to sealing at the top, but it looks like the door rather than the seal. I'll get brother to give it a bending - he's good at that. I think the nearside doors will both want replacing, but hopefully not yet. I found the water with my car vac, which doesn't seem too happy about it...

Everywhere else seems dry, though.
Boot was full of wood-shavings and cardboard- I think there's been a bottle of LHM leaked in there, as it there's that feel/smell about the wood-shavings (possibly used to soak up the LHM?) and the boot carpet. More investigation to follow, but at least all the crap is out of the boot.
Non working brake-light turned out to be only the bulb. Finally some good news
