Clapham Wind Tunnel One area where being able to talk to the people who worked for John Laing is really helpful is unravelling the odd mystery. I have noticed that in a number of photographs from the 1950s there is one or two individuals who had a large L on their jacket. I speculated on what this might be and thought that most likely it was to designate the leader of a team of workers. I was able to put a short piece in John Laing's Retired Employees' News asking for any information on the mystery L and several people kindly wrote to explain the mystery - which was no real mystery at all. The L simply stood for Laing but only new employees would be given a jacket with the logotype and so this took a long time to permeate through the organisation. A case of applying Occam's razor and not overthinking things for me.