Welcome Pugwash! And welcome Indy Singh, I forgot to say that in my last post.
Pugwash that sounds like a fair deal, especially if it's a manual.
Your aircon condensers are most likely leaking. Have a look in each side of your front bumper and see if they look old. Same goes for rads (which the condensers mount in front of).
I'll be doing all 4 of mine (2 rads, 2 condensers) in a couple of months.
Easy diy job and doing it yourself means you have time to do it right, doing things like powder coating the mounting brackets and renewing all bolts etc.
Then you can just get your Indy, or anywhere actually, to re gas it. Loads of how to guides online and on YouTube.
The parts are only £210.
Condensers-
https://www.ebay.co.uk/itm/181516317166
Rads-
https://www.ebay.co.uk/itm/291077287526
Ask the seller of the condensers to throw in bolts and o rings and they usually do.
Anyway sorry for veering of topic slightly.
So who's gonna buy that aerokitted car then?
I think now, any straight 996 with no hidden horrors is worth £10k so a manual C2 with Aerokit for £10k is a good buy. It's only the mileage on that engine that throws a bit of a question mark over it, but who knows, it could have another 30,000 trouble free miles left in it. Or more...
Good luck with yours Pugwash and good luck with your search Indy Singh.