Paul, just as a heads up you might want to check out Seabrooks range of Gluten Free crips if you haven't done so already. Uk company, very nice crisps and just as good as walkers IMO. They do variety bags of 6 small packets and also have a posh flavour range in bigger packets (their steak and ale crisps are delicious and a personal weekend treat for me). I only found them a few weeks ago and jumped for joy when I tried them.
Available in Tesco's but you'll find them elsewhere as well I'm sure.