Those are rare - nice find!
Now that you've mentioned the 1911 series, I picked this up a few months ago. Oddly, it included a few of each denomination known, except the florin, which was missing entirely. So I think you may have the rarest of a rare set!
Link: Unpublished toy coin box with 31 coins dated 1911 - £0.00 : Rare Coins and Tokens, On Line Catalogue