I have a copy of S&A signed by the author.
It was one of the Broads 'Dick and Dorothea' stories where the plot turned on a bicycle puncturing, and unable to be repaired because it was Wednesday half-day and so the LBS was closed.
So much for self-sufficiency!
[edit] for those in Yacf who like this genre, I strongly recommend Gary Hogg.
There's one called 'Five Awheel' or something similar, which is pretty much the same scenario as S&A but done with two tandems plus the 'favourite uncle' on a solo, set in Wessex.
Cerne Giant and all.
Another, better book featuring the same characters is 'The Granite Men'.
(both suggestions from distant childhood memory of course)