Here are some links to great gluten free businesses that I heartily recommend:
Great, widely available gluten free sausages – The Black Farmer
A wide selection of gluten free flours, pasta, cereals, biscuits galore – Doves Farm
Pure, gluten free Scottish Oats direct from the farm – Tilquhillie Fine Foods
Gluten free tortillas – Cool Chile Co
Flaxseed flapjacks can be found at Borough Market – Flax Farm
Naturally gluten free power snacks, many with underused millet – Conscious Foods
All gluten free, some egg free and dairy cakes and bakes – SugarGrain
Dedicated gluten free bakery and cafe – WAG Free Bakery
Naturally Gluten Free 
Lesley Brown said:
Browns of Stagsden (Bedfordshire) make a wide range of GF Sausages and burgers, available in our Farm Shop. At least two different flavours (sometimes more) are made every Wednesday to be sold fresh and there is usually a selection of other GF Sausages available in the freezer. You need to read the small print, or ask our helpful staff as they all are so good that we don’t call them GF as we don’t want other customers to think they’re only for celiacs
Adrian said:
Kim ! What about us ! 🙂 Small producer, handbaked gluten-free cakes, owner-managed by a gilr (try calling her that) pastry chef: http://www.honeyrosebakery.com
Can we send you samples (where in rive gauche Londres) to judge for yourself if deemed worthy ?
Cheers, Adrian
Ingrid said:
You must try ABO Artisan Bread Organic Sourdough Style bread – looks like wheat – tastes like a sourdough should – AND IS GUARANTEED GLUTEN-FREE and ORGANIC – no gums, no additives. Available online and in Planet Organic and Wholefoods. 100% good