Thanks for all the comments guys! I completely missed that this post was active again!
And most of all, tack så jättemycket Tuure!!
I was curious when I bought it to what model it could have been and did a little research but didn't come up with much.
I don't know whether it's a good or bad thing but I've rarely used this bike (thanks to a crap summer) but I found a period correct front mech on ebay to finish it off. Now it spends most of the time hanging from my lounge wall, were it gets a lot of attention from people who know nothing about bikes, they love it!
After reading the bike's history it makes me what to re-restore professionally it to it's proper colour (orange is goooood!) and buy some decent tyres for it - I just bought cheapies because I didn't know how much I'd use it and they're 27"/630 which makes them hard to find.
Here's a few more pics...