Thanks for that - I have taken some more pics of the seat lugs and also views of TT and DT lugs and any others I could find!!

I will have another look online to see if I have any more luck in finding out which model this is, but would really appreciate your help - I don't know much about these old bikes at all! We bought this bike as a one off as thought it might be worth something and have spent some time cleaning it up.

If anyone out there can give me an indication of it's possible value that would be helpful.

Thanks