This 1979 Flying Scot (16" frame / 20" wheel) , must be amongst the smallest 531 based, 'NR' equipped frames ever produced, or go down as the best Christmas present a dad could give...
http://www.flying-scot.co.uk/
Unless of course you know different ? :-)
-- Bob Reid Stonehaven (where it was "summer" at the weekend - 18 deg and the highest for any January on records and it's minus something today and snowing ! ) Scotland (Global warming capital of the world)
The Flying Scot Website - http://freespace.virgin.net/