In the nine months to last Christmas I shed three stones and I haven't put any back on. You need to eat decent-size meals so that you can cut out those snacks and choc. You won't miss 'em. Don't skip breakfast but have something filling like porridge (minimal or no sweetening). No cereals. At lunchtime make your sandwich 3/4 the size you're used to. A couple of times a week we just have a big mix of fruit for lunch, a bowlful of bits such as pineapple, pears, apple, melon, grapes, blueberry and banana. Those oven chips of yours are great. I make mine with unpeeled spuds, cut into chips, parboiled and baked in groundnut oil. Fish of all kinds is brilliant. We eat lots of pasta dishes, with which it's easy to exercise portion control. I have three or four Italian cookery books and they have been my saviour. I'm making a big batch of minestrone for tonight and tomorrow and some rich pea soup for Sunday which we'll have with home-made bread. If your soup is rich enough it'll do for a meal on its own.
Throw those Quorn jobbies away and buy some proper butcher's bangers - you've gotta live, you know! ;-)