Thanks for the info. I will measure the seat post diameter when I next get the chance.
I can tell you the stickers were applied in a very shoddy fashion and not even straight. The paintwork is also peeling. It appears that it may have had an unofficial recondition of the frame. It may not even be a Viscount?
I posted more pics of it on here:http://forum.ctc.org.uk/viewtopic.php?f=1&t=73853
Something else pointed out was that there were no lugs used on the bb so it may be easier to identify it by that.