I did slimfast, but that was because I had eating 'problems' when I first started. Not through an eating disorder but because at the start I had undiagnosed acid reflux and it just HURT to eat so I ate veryvery little (like some toast with nutella for each meal or weetabix or something small and easy for a few weeks before/after starting) and well... everything tasted like bleach - including drinks - so why bother making something else?

It did work for me in that they tasted better than I thought they would and also I didn't get as hungry as I thought but the actual SF plan isn't for us as we need more calories for the snacks/evening meals than 600 can give us as they recommend.
That small an amount (300 snacks and 600 meal) would slow/stop our weight loss pretty quickly too. Your BMR (what you burn resting) is 2455, using the equation by saying light exercise (it'd increase if you are doing/start doing more) would be 3375 so realistically you'd need to be eating a good 2500-2700. Given that the slimfast shakes would be under 500 cals that gives you at least 2000 that you still need to eat...!
Big portions are an issue too, but there are better things you can eat larger portions of - like salad and veg - those are pretty small calorie amounts) same with a lot of fruit too, especially berries. (though be careful of the sugar in them). There are certain things you can try and fake for a takeaway by copying it but say... grilling it or something like that?

or making your own pizza's with lighter ingredients so you know what's in them?
If you can develop an interest in cooking from scratch if you haven't gone one already then you can be in complete control of what goes into your body at all times without additives or fatty meats
(though NOTHING beats the convinience of someone else cooking for you, especially when they deliver it

!)