Hi Rob, one of the best things you can do for yourself at this stage is get to know food a bit better. You don’t need to be a walking encyclopaedia but you do need to develop an understanding of what is good to put in your mouth. Generally the stuff you cook yourself is going to be better for you. So any meat including the skin, eggs as often as you like, as much fish as you can face. Plenty of full fat yoghurt, butter oils, nuts in moderation. Vegetables grown above the ground are better than those grown underground but onions, leeks and carrots aren’t really the enemies in the grand scheme.
Avoid all bread, pasta, rice, potatoes of any kind.
Find an on-line calculator that you like and consult it frequently about foods you don’t know the composition of. I use calorie king because it tells me about carb content. The nhs do a calorie counter which is quite good too, just google them. Porridge is ok but when carbs are important, its quite high.
It might all seem a bit geeky but you really do need to know the basics for yourself, it will make more sense of your weight loss (or any plateaus you experience) as you go on. Do this for yourself. Count your calories up to 800 or your carbs up to 50 grams or both. You can do this, but you do need to put your mind to it. (Write down everything you find out, then you only have to look for the info once!)