Thanks guys, you are all so helpful
Wedgie is going to Matt at Auto impressions this week, to get her remaining (and hopefully last - for a little while at least) mechanical issues sorted. She's already had a service and some hoses, filters etc changed, but needs a few other bits done, that we were advised to have done by a VW specialist. She will also have a tune up and I've asked for any other bits to be sorted while she's there, then she is going back to my local mechanic who specialises in bodywork. He's had a good look over her and has quoted me £700 to get all her minor rusty bits repaired. Generally, she's a very solid old gal,very clean underneath and in good nick for an old lady. Despite a bit of filler here and there, her bodywork looks great, but on closer inspection she has a few little bits here and there that I want to nip in the bud and keep on top of. I pointed the small rust spot around windscreen area out to Phil, and he will deal with that when he has her in to sort her out. Hopefully then, that should rid her of the indoor pools in wet weather!
Once he has dealt with the rusty bits, I will put a good coat of Collinite on her to help her through the winter, especially as she will be living outdoors until we move (hopefully soon) back to Kent. We will get there, she's worth it!
PS. will post a pic of the rust around the windscreen rubber seal on Thursday M.M, as Wedgie is currently parked at my friend's place. Only have space for 2 cars and until she is properly sorted and ready to roll, I am still using my Renault. in the meantime, I will post a couple taken recently after she had a thorough wash and clean up that took me all weekend. Looked and smelt so much better though, so was worth the effort.
When it rains, we find a small puddle of water on the front passenger floor mat, and also on the floor underneath the mat. There's some surface rust on the floor, so it's obviously been like it a while. 
