Hi Englishcoins - I can help with France:
From the Revolution (adoption of decimal currency): 20c, 25c, 50c, 1F and 2F were.900 silver to 1863, then .835 silver to 1920. Minting stopped in 1920.
5F remained .900 silver up to the last circulation issue in 1878.
The only silver coins issued for circulation between 1920 and 1960 were the 1928-1939 10F and 20F coins, which were .680 silver.
When the French franc was revalued by the Fifth Republic, the new 5F were .835 silver from 1960 until 1969, and base metal from 1970. The large 10F coin issued from 1965 - 1973 was .900 silver, as were the 1974 - 1980 50F coin and the various 100F coins issued from 1982 until the introduction of the euro.
Most French silver commemorative coins issued since the euro was introduced have been .900 silver, but the 'Regions of France' 10-euro coins issued in 2011 and 2012 were .500 silver.
It's difficult to be exact about British colonies, as they were all different - some issued no silver coins at all. Many of those that used £ s d struck coins to the same standard as Great Britain, and some of them debased their coins from .925 to .500 silver just like the UK.