Hey Jennifer! Sorry it’s taken me so long to reply.
For sunflower spreads I found them in waitrose and sainsbury’s but I’m sure Asda will have one, just check the ingredients, make sure it’s ‘all pure’ with no whey or butter/dairy ingredients.
I can’t remember having any luck looking in the UK for stock cubes but I didn’t look too far but I’m in Canada now and the brand I use is McCormick (gourmet) all-veg Bouillon from a store called independent (just like sainsbury’s).
Rice and Soy milk are usually found in the health/alternative/specialist section, each store has one of these sections 
near the UHT milk, not in the refrigerators! They’re in cartons usually a litres worth is a few pound each. If not I’m sure holland and barratt would have some. Coconut milk is in regular grocery store stuff next to ambrosia rice type cans. The coconut milk comes in cans, that’s the best prepared way to get them powder is crap! Personally tried both.
Hummous either make yourself in a blender, some simple recipes online - careful using apple vinegar or seaseme seed oil - use very small amounts of these things as they’re super strong in flavour! Or if you don’t want to make it yourself just check all the ingredients on the labelling, own made brands are usually the best bet here, they have less stuff added too them. Unlike sausages, best to go for the best with them as they have less preservatives or unnecessary bad stuff in them.
I was drinking loads of squash until my mum pointed out that this is basically concentrated citric juice lol - and lime cordial, stopped all the tasty additives to water/soda, I’m like you, I’m not a big water drinking so I was flavouring it to make it bearable, I realise now I shouldn’t have been doing this 
I don’t like the taste of water naturally so I’ve had to force myself to drink it!
Also I was soooo unhealthy before! I lived on diet coke, coffee, cigarettes, chocolate, cheese and bread. I never ate regular meals. I had to make changes to feel better. It was a nightmare at the beginning but now finding alternatives and being more adventurous is quite fun. I love Moroccan, Turkish, Indian and Thai food, so I’m cooking for of this type of food. Eating bucket full-s of rice! Carrots and apples, you get used to it. It took the people are me longer to accept the changes than me to be honest… And Overall yes I would say that I can tell a difference. Chocolate was not doing me any good, I feel really ill if I touch this at all now or cheese, and I’m a lot less lethargic in general (apart from bad or very bad days, nothing can help these) 
A few other things I really like are roasted veg trays, just cut up loads of veg with garlic herbs salt pepper and oil and bake for 45min, delish! For mash potato I sometimes use squash or sweet potatoes/carrots instead and with soy silk and alternative butter plus loads of salt and pepper it tastes really good! Oat in the morning for small amounts only oats - can be a good start, they made me feel pretty dizzy though. But you might be okay with it, who knows… Oh and teas, yogi teas are delicious
Black beans, you can get them most places no? I brought loads of different cans of beans at the beginning but never got round to eating them lol, great for salads! And also the one thing I’m not sure of is lentils, can we have them? I think so -i can’t see why not, unless it’s to do with glutamate. Anyway, what I loved making for dinner was a tuna steak on top of a baked potato with loads of veg and some roasted pine nuts with loads of that sunflower butter. Super good! And cheaper than a steak (which is option no.1 at all times if money allows)
I know how tough it is to shop through this whilst dizzy, I had no idea what I was buying and refused to eat anything that wasn’t organic for the first week because I started freaking out about what the food way doing to my brain. I also didn’t have the energy or stamina or focus to go around a superstore reading labels and getting even more confused. This was all at the beginning of taking a new drug as well, so I was we’ll into Lala land by this point. Once you find a few things that you like that you can have and can make in bulk it’s easy and much healthier, it’s not as convenient as buying packaged stuff but at least you know you won’t trigger symptoms. And honestly cost wise can be cut in half if you buy fruit and veg from your local grocer - we used to have one down the road from us so would buy what was in season and see what I could make with the ingredients. Fresh soups are the best for lunches too cause you can make enough for a whole week and freeze batches. Plus if you find recipes online you like the look of just modify it to work for you
Loads of love,
Trish
and would probably starve without it, but I am obviously avoiding fresh bread, but I do avoid yeast extract, which is another name for MSG and is in tons of things. That being said, I probably only have two pieces of bread every other day, so not that much really!