Kaz, we borrowed from your recipe and in our rock cakes, we are now using 2oz rolled oats and 6oz S/R flour rather than a straight 8 oz of the latter. Gives a much firmer mixture to ladle out, and a more satisfying consistency.
We are also currently using 50/50 raisins and mixed fruit, rather than just mixed fruit, but that all down to what's available in the shops.
We also haven't looked back since rediscovering
Stork, rather than using Clover spread ....