There are lower carb breads available, and there have been a few discussions about them,. so have a search through the low carb area of the forum - I believe one is called LivLife(?). Check the carbohydrate values on the nutritional labels on food, and keep on using your meter to check the different brands. Tesco and other online (grocery) shopping sites also provide this sort of information for their products, which I find very useful.
The number of carbs you eat depends on how your body reacts to them, so there's no set answer for everyone. Just avoid all potatoes, bread and flour, pasta, rice and cereals, as well as all the sugary food - cakes, sweets, biscuits, etc, and high sugar drinks, including fruit juices. Keep on using your meter to discover how you're managing and whether you need to cut back further on higher carb foods.
Robbity