I eat
Schar crackers (they melt in my mouth)
Nairn’s g-f range, eg - super seeded oatcakes. They come in small packets inside a bigger box, so can be handy to carry in a handbag for emergencies.
Tesco cookies, especially the ginger ones, with and without chocolate covering.
M&S has a good range of very tasty g-f items, although some of them have a lot of ingredients.
Avoid cakes from Tesco, Sainsbury’s and so on, because they do have a lot of additives including preservatives. M&S ones are fine, but not their flaky pastry range.
Basic g-f biscuits, such as digestives, ginger nuts and custard creams, can be hard and tasteless. Boxes of cookies tend to better although more expensive.