Chocolate and vanilla pinwheel biscuits

I’m trying to challenge myself during lockdown as much as trying to use what’s in the cupboard so was looking for plain flour biscuits as there is no SR flour to be had right now - I do wonder if the whole nation is currently baking cakes.  This is from Mary Berry’s Baking Bible and the first time I’ve done anything like this - ie an attempt at something more decorative and precise.  I was pretty pleased with these although I’d play around a bit more with flavours if I made them again.