I bought a gents 1952 one owner in need of a fair amount of work for £75 and last year got one for my wife 1958 for £50 that only needed a good clean. Having said that I have seen these go for loads more.
I have some frames that I may sell on if you are interested. All basically the Lenton but under different badges.
1948 Humber Beeston Clubman
1952 lenton 21"
1957 Rudge Pathfinder 23"
And probably more that I have forgotten about.