[David_Hayward (RIP)]

Thanks Clive...it would appear that the National Archives advised incorrectly since they said that as WW2 photos were '1949 and earlier' that they were free of copyright. In respect of National Archives of Canada photos copyright has expired, but they request that the photographer or artist (if known), the NAC and copy negative number is set out in any acknowledgement.

I will have to check further, but assume at the moment that 75 years applies?