Just to say lemon drizzle cake with Doves Farm self raising flour works really well - gluten free cakes/biscuits can get crumbly and dry, so adding the lemon makes it all moist - yum I made one last week and took it in to work - no complaints from the team!
If you go to the nigella website, and try her cookie recipes, I find that modifying with gf flour works really well. I have used corn and rice flower mixes in the past with great result. The same works well for Victoria sponges. They dont taste exactly like a normal victoria sponge, but near enogh. With cream and jam layers, the difference is hardly noticable.