The following people have kindly contributed entries or other information to the online supplement:

Ulas Akin

Sherin Aminossehe

Alan Barber

John Belchem

Max Boucher

John Bruce

Nahoum Cohen

Jessie Cowan

John Davison

Richard Deiss

John Elcock

Christopher Gray

Ben Guy

Ben Hamilton-Baillie

Stephen Paul Hardy

Andrew Hillhouse

Joe Holyoak

Robert Huxford

Stephen Meakin

Derek Middleton

Carole Pralong

Bernd Streich

Andrew Stuck

Sebastian Tombs

Mario Yacoub