1946 was the last year for silver. Close. You could click FORUMS and go to WORLD COINS. But I don't think it matters. It's fine here.
There isn't a site specifically for shillings but this would be the best place to post it. CoinTalk is great because it has forums for different types of coins (World, American, Ancient, etc.). "Coin Chat" and "World Coins" are both perfectly suitable places to post about a British shilling. I have several myself .