I gather that the Canadian Army troops stationed in Reigate as part of the GHQ Reserve were
(1) the “Hasty Pees”: the 1st Batallion of the Hastings and Prince Edward Regiment, Ontario. Prince Edward, the Earl of Wessex is their Colonel in Chief. He visited them in 2005 and there are some wonderful photos at http://www.theregiment.ca/hpjornal.html.
(2) the Royal Canadian Regiment. The Duke of Edinburgh is their Colonel In Chief. They were in Reigate in October-Nov 1940, then January-March 1941.
There is also a reference online to a Canadian liaison officer, Captain J G Stewart of the Canadian Grenadier Guards.
Now that I have given my first public illustrated talk about 'Reigate - SECRETS of the war years', I have put together a brand new A3 hardbound presentation photograph book that tells the story and shows what the town looks like today. If anyone is interested in viewing it or obtaining a copy, do get in contact. The number is +44 (0)1737 217013.