I echo Liz' comments about making butter spreadable. I suspect UK loaves are not too different from Oz ones; a standard loaf has 24 'thin' (read 'ordinary') slices or 18 'thick' or 'toast' slices. The number of slices was the only novel (to me) info I picked up at an in-service, for teachers running school camps, in the mid 70s. I already knew of the "Recipes for 50" published by the then Commonwealth Dept of National Service and later the Aust Govt Publishing Service; it had the only recipe for corned beef that equalled my mother's.