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1.5 oz (40g) caster sugar, pinch of salt
3 or 4 tablspns of milk
(Optional) 2 tablespoons yoghurt and reduce milk accordingly
(Optional) a few drops of vanilla essence
As for the milk, use whatever kind you have in the fridge. Granny would use milk she had allowed to go sour - and her scones were always so light and soft - but I haven't tried this. Buttermilk works well, if you can find it in the shops - otherwise ordinary milk mixed with plain yogurt - or just milk is fine too