Hi and welcome. Feeling shocked and scared after your diagnosis is totally normal, and what most people go through. As Inka says, 80 mmol/mol is not horribly high and you can look on this as an opportunity to become a healthier dad and husband.
There's lots of stuff posted online, but this Forum is really the best place to seek advice and learn - between us we have centuries of experience. The initial suggestion for newly diagnosed Type 2 is to look at lifestyle changes. Please have a look at the Learning Zone on this Forum as it will give you all the information you probably didn't take in when you were diagnosed. I suggest one module a day, starting with food and then exercise. For you, dealing with the mental aspects will probably be very helpful as well.
Reading your food diary, I see you follow a very typical modern day diet, with lots of high carb foods. It is suggested that you should aim for less than 130gm carbs per day. This does not mean NO carbs, and the reduction should be done slowly so as not to affect your eyes. So you will be best advised to get your wife on board to help you make adjustments to your meals. It will probably benefit her, and educate your children as well. The items to reduce are bread, potato, rice, pasta, cereals, some fruits, processed foods, and of course cakes, biscuits, sweets, pastries. Smaller portions, bulked up with vegetables and protein.
I've run through your quoted meal items through my app, to give you an idea of your daily carb intake. Getting an app was the first thing I did on diagnosis and is great for portion control and keeping me on the straight and narrow. You will be surprised at how high some of the items are. (Shame they taste good)
Costa Coffee Vanilla Latte - from 17gm carbs for a small with skimmed milk, to 34gm for a large with full fat milk
Sausage roll (Greggs) - 24gm carbs
Cornish Pasty - 52gm carbs
Tesco Chicken salad sandwich - 45.7gm carbs
Tesco tuna sweetcorn salad - 51gm carbs
12" pepperoni pizza - 1/8 slice 17.7gm carbs, or 71.3gm for half the pizza
Homemade lasagne - from 40.8gm carbs for a 340gm serving to 62.5gm for a 520gm serving.
2 pieces battered chicken - around 12gm carbs
This is before you take into account your drinks, vegetables, fruit, puddings, snacks.
You might like to consider having some breakfast at home - for example Greek yogurt with berries, rather than stop for a latte and pastry. Then taking in a packed lunch like a salad with boiled eggs, tuna, chicken, or a thermos of home made soup. You or your wife could make batches of healthy home made foods. I use a slow cooker and freeze portions. These are just suggestions.
Some people follow
lowcarbfreshwell.com/resources/meal-planners/ which would certainly give you plenty of ideas. It is said this is a marathon not a sprint, and to take it slowly so your body adapts. Have you considered swimming? I go to the pool twice a week. But exercise can be as simple as doing more walking, joining in more with the children and their games.
You are not alone, so please ask any questions you may have, as we have all probably asked them.