Many thanks to Bob Reid and Griff King-Spooner for the information on the Wedgelock cotterless chainset. If anyone comes across a copy of "The Cycling Handbook" by A.L.Pullen & published by Sir Issac Pitman with this chainset in it, please could you send either me or Bob a scan of the Wedgelock for our records.
Best wishes and be lucky. Michael Butler Huntingdon UK.