GrandmaMia! Actually, as a vegetarian, you are well placed to cope. Rice, potatoes, sweetcorn, pulses, nuts, vegetables, salads, fruit, cheese milk and eggs are all fine. Obviously wheat products, including bread, cakes and pasta, are not allowed. Processed meats are no good either but that's not going to bother you. Do watch out for flour used as a thickener in canned and refined foods and ready meals. No barley-based drinks – alcoholic such as beer or non-alcoholic, such as lemon barley water – should be consumed.
Cornflour, rice flour, soya flour, potato flour (farina), chestnut flour, polenta (cornmeal), buckwheat flour, chickpea flour (gram), sago flour, tapioca can all be used as substitutes for wheat flour.
Nowadays, most supermarkets stock a range of gluten-free products but they do tend to charge through the nose.