How to make the Queen's drop scones
Beat eggs, sugar and about half the milk together; add flour.
Mix well, adding remainder of milk, bicarbonate and cream of tartar.
Fold in butter.
In the letter she also offered her own tips for making the delicious Scottish pancakes:
"Though the quantities are for 16 people, when there are fewer, I generally put in less flour and milk, but use the other ingredients as stated.
"I have also tried using golden syrup or treacle instead of only sugar and that can be very good, too.
"I think the mixture needs a great deal of beating while making, and shouldn't stand about too long before cooking."