Yoghurt is an easy one, mate! Get down to Lidl and buy a 1kg bucket of full fat greek yoghurt. Add some strawberries/blackberries/raspberries (even a little bit of sweetener if you like) and you're laughing. Has very little effect on blood sugar.
The chicken stir fry sounds good - but I don't touch Brown Rice. (I'd just chuck an extra Chicken Breast into the stir fry!) Green veg is awesome. Spinach, Cabbage, Sprouts - I've found they all help to keep the BG down when eaten at meal times.
Bread is (for me) the hardest thing to do without. Brown/white/granary - they all have a negative effect on my bg.
(My god I miss Cheese n' Onion Sandwiches!)
Porridge for breakfast (at least for most around here) is a big no-no. Even the Ryvitta would have more carbs than I could handle.
Soup is good - especially home made soup. Just don't thicken the soup with potatoe.
Snack wise - nuts are good. Avoid Cashews and Peanuts, but dig in to Pistachios, Macadamias, Brazils, Hazelnuts, Walnuts... Sliced meat is handy, and cheese can be a great snack. You'll only need a little to feel satisfied.