If you want to understand the shortages faced by cyclists in 1949, you need to read this booklet, packed with references to a more bountiful pre-war world of plenty and with plucky attempts to recreate it.

The derailleurs feature on page 5 and page 6, just before the CurAcho (pronounced Cure-Ache-O) embrocation.

I am also pleased to see the Primus stove (or its British made derivative) - perfect for a drum up.

• Publisher: Holdsworth
• Country: UK
• Date: 1949
• Derailleur brands: Constrictor, Cyclo Gear Company, GB, Huret, Osgear, Resilion, Simplex, TriVelox
• Derailleurs: too many to mention