Norman,
As you're aware, there were around a dozen contracts placed with Woolwich between 1936 and 1940 for "repair and conversion" of small numbers of No.36 MkII, including:
132 for Australia in May 1937;
228 for Canada in November 1938;
1,008 for Eire in May 1939;
200 for New Zealand in July 1939;
382 for the Air Ministry in May and August 1939.
Conversion is clearly replacement of the base plug, and as of the April 1936 entry in List of Changes, the drilling of five holes in the body. Perhaps repair meant new components (lever, spring, striker) where deemed necessary to replace rusted ones, and a fresh coat of white paint...
Tom.