Right, first things first thanks to those of you who've offered advice, posted links and spoken encouraging words. Good craic all round, I appreciate it.
Had a nose round the car this morning hunting the source of the leak... Can I f*ck find the A-pillar/footwell/knee vent that a few of you have mentioned. I feel a bit of a plank asking this (And Lord knows I've googled those words looking for images without success), could someone grab me a picture of the actual vent and it's location? I'm stumped...
Things I have found that look off include the windscreen. I could be wrong but the bottom corners of the should perhaps have a piece of trim here? Both sides are the same...
Again, it feels like something rubbery and tuber shaped is missing here (Both sides are like this)
And the sunroof, sealed like this all the way round. Thoughts and prayers are focussed on it not being this. I'd imagine unpicking all that stuff without damaging the surrounding paint would be hours of fun.
Onwards and upwards, kick trims have been removed and carpets/foam etc has been lifted in effected areas...
It was properly soaked through, I must have sponged about a litre of water out. Good news is it's definitely not coolant, rain/hose water for sure.
Next step was to bring out the Glen2000
very dangerous a wonderful piece of equipment I bought at a carboot sale for 50p after getting sick of Mrs Eunos's complaints about missing hairdryers. I suspect Glen was made in an era when the number '2000' had space age/futuristic implications...Either way, he doesn't turn off when tilted, nor when he gets too hot, he simply soldiers on no matter what. As you can see in the picture he is slightly melted after being used in anger in the past. I utilise him for everything from hardening paint, warming underseal, right the way through to drying out car interiors.
2 hours of Glen action later and everything is bone dry. At this point life got in the way so the only testing I've managed is a jug of water over the bottom corner of the windscreen, no leaking was produced, further investigation will now have to wait until next weekend