Wheat Free Shortbread

All butter shortbread, a Scottish tradition. The recipe I used was from the BBC Good Food website and it was very easy to make. I substituted the plain flour for Dove's farm wheat free plain flour and I also cooked it for a little longer than it stated because I didn't feel 20-25 minutes was long enough.
Ingredients:
300g softened butter
140g golden caster sugar
300g wheat free plain flour
140g rice flour
The method is very simple, first mix the sugar and butter in a food processor and then add the flour, mixing until smooth. The recipe says to put the mixture into the baking tray and then place cling film over to smooth, however I found it was much easier to wrap cling film around a spatula (to prevent sticking) and use this to smooth out the mixture. I then baked mine for about 28 minutes, until golden.