Hi Richard, try these sites
http://www.marriottworld.com/stock/lampstock.htm
http://web.onetel.net.uk/~parfittwar/sale3kk.htm
http://www.leescameras.demon.co.uk/
They might be able to help
You dont state the model of the Pathe projector, that would help
Best of luck
Alan Hodkinson, July 2009