Gluten-free cheese scones

An unexpected - and very, very welcome - visit from my sister-in-law and her husband this evening.  And no cake or anything in the house.  So I thought I'd make cheese scones, which are quick and easy - but just as I was standing on the stool looking for the flour, I remembered that my sister-in-law has coeliac disease and wouldn't be able to eat normal scones.  But, of course, neither gram flour nor buckwheat flour has gluten in it.... this might work....

125 g gram flour (besan, chick pea flour)
125 g buckwheat flour
Pinch dry mustard powder or cayenne pepper
50 g butter
125 g strong Cheddar, grated
1 tsp baking soda
1 tsp lemon juice
About 120 ml milk

Rub the butter into the combined flours and baking soda, then stir in the cheese.  Add the lemon juice, and then gradually add the milk until it comes together in a ball (I was using a food processor, as time was off the essence).  Squish it all together, then flatten into a rough disk and bake in a hot oven (Mark 7) for 15 minutes.  Serve at once, with butter.

No, they weren't as good as normal cheese scones would have been, but they were eminently edible!