I agree with mare - aim for fruit for two of those 'fruit or cereal bars' - keep the cereal bar to one a day.
Also - must tell you - having lived in the UK for years (including Yorkshire! Whereabouts are you??) spag bol, curry and chips, chicken w/pasta in sauce, and pasta in sauce are NOT wise dieting choices. That's not to say you can't have these things, but I'd restrict those choices to choosing one or two of them, once or twice a week. Regardless of portion sizes, these carry a lot of fat as well as calories. (Of course, if the chicken and pasta and sauce are Lean Cuisine or something, that's okay, but even then, they can be very high in sodium, which can slow weight loss.) If you absolutely MUST have a curry, by all means have it! (you shouldn't dis-allow yourself anything, or you might feel deprived and go on a binge... or maybe that's just me!
) You'll learn, too, that there are better curry choices than 'curry and chips'... those chips are a killer to weight loss! Try your favourite curry with rice, and only have a half portion of the rice provided, or better yet, try a tandoori dish (dry cooked) instead of a big creamy Korma or Tikka Masala, if that is what you favour.
As for breakfast and lunch - choose a low-fat spread maybe, and be careful of portions for sandwich fillings - these can be self-deceiving and add calories! Even breakfast - as you lose a couple of stone, you'll probably find one Weetabix is enough to give you a great start to the day! You might find it helpful to switch to semi-skimmed milk (2% here) if you haven't already, and be sure to consider it if you have a lot of tea or coffee with milk during the day.
A jacket potato with beans is a good choice - filling, low-fat, high-fiber
Ideally, you'll aim for more veggies than in your suggestion, but go slow if you're not used to them - LOL! For example, are you adding lettuce and tomato to your sandwiches?
These are, of course, just my opinions.
Hope some of it is a little helpful, and keep checking in and let us know how you are doing!!