Yes, all British general circulation silver coins between 1919 and 1946 contained 50% silver.
The British Double-Florin (Four Shillings) was issued from 1887 to 1890 inclusive. The were made from sterling silver (0.925).
A 1942 British Florin is 50% silver, the rest being base metals such as copper.
All British Florins from 1921 to 1946 inclusive, had a 50% silver content.
The British sterling silver Double-Florin (Four Shillings) was issued from 1887 to 1890 inclusive. They weighed 22.62 grams.
The British Double-Florin was issued from 1887 to 1890 inclusive. It proved very unpopular due to its size and weight. As with all British silver coins of this period, they were minted in sterling silver or 0.925 fineness.
No British general circulation coin minted after 1947 contained any silver at all.
Zero. All British "silver" coins from 1947 onwards, were made from a copper-nickel alloy.
Florin Court was created in 1936.
Many British coins were once made of silver. Threepence, Groat, Sixpence, Shilling, Florin, Halfcrown, Double Florin, Crown, Maundy Coins amongst others. If you go back in time far enough, even pennies were silver. From 1947 onwards, no British general circulation coin contains any silver.
The only British 22 carat gold coins issued in 1899 were the Sovereign and the Half-Sovereign. The Florin was a silver coin from its introduction into the currency in 1848.
A British Double Florin (Four Shillings), was only issued from 1887 to 1890 and abandoned possibly due to its size and weight. The Double Florin was made from sterling silver, was 36 mm in diameter and weighed 22.62 grams. A British Florin (Two Shillings), was first issued in 1848 as a tentative first step towards decimalisation, a Florin being 1/10th of a Pound or Sovereign. The British Florin was last minted for general circulation in 1967. The Florin from the period 1887 to 1890 was made from sterling silver, was 29.5 mm in diameter and weighed 11.3 grams.
Of the countries issuing a Florin (Two Shilling) coin, only Australia ever issued a commemorative Florin, but there were no commemorative Florins issued in 1936.