UK low cal ready meals

Quick meal for me is Asda Savoury Cauliflower Rice and a can of Heinz Dhal Curry Lentils.
The rice is 168 cals for the whole 400g bag and the Dhal is 276 cals for the whole can.
I usually have this after swimming and classes on a Monday night as not home until 9.30pm and don't want to cook.

Soup!
I find tins of soup the best solution for quick, lo-cal meals. I find the Baxters ones most like home-made (and as a self-confessed 'fat-because-foodie I'm fussy about such things). Several are well under 150 cals a tin which means you can have a slice of bread too if you need filling up (easy on the butter though) and still have a very low calorie meal. I also try to keep a few hardboiled eggs in the fridge either as a snack or to add protein but only a few extra calories to a meal of soup. Alternatively, after the soup a prawn sandwich with lo-cal mayonnaise instead of butter is another option low in calories: one third of a bag of Tesco frozen prawns is about 70 calories. In fact frozen prawns are really handy for all sorts of minimal cook meals. Half an avocado, some rapidly-defrosted prawns, some lo-cal mayo: what's not to love?
In terms of hot, minimal cooking meals, what about instant prawn curry? One third of a bag of prawns, a dollop of Philly (lo-cal if you prefer), plus a spoonful of curry paste (Pataks do various kinds): heat the Philly and the paste in the microwave or on the hob, stir till hot and mixed, then stir through the prawns and reheat briefly. Ten minutes, tops. Serve with either half a packet of microwave rice (can't remember the cals, but it's not awful) or, if you've made some on the days you do feel like cooking, some cauliflower 'rice'. (If you've not yet discovered this brilliant idea: cooked cauli pushed through a ricer, or 'riced' by bashing with a metal or silicone whisk, or just finely chopped as you would, say, rice: I even allow myself a little butter added to eat when hot.) Or, my new ultra-lo trick: a Little Gem lettuce very finely chopped, again, as you would herbs, to make 'lettuce rice'. You could probably pulse blitz in a food processor, though I've not tried that. (Not sure if I invented this lettuce rice or saw it somewhere.) It needs to be Little Gem, to give enough texture, or maybe cos would work: haven't tried. I don't think ordinary lettuce would work.) I've found my 'lettuce rice' works well with anything in a sauce as it mops up the sauce almost like mashed potatoes, and it's great as a rice substitute with curry.
Alternatively, what about pre-cooked baby potatoes, microwaved and eaten with some sort of grilled (easy and no prep) chops plus microwaved ready-meal veg: Tesco Finest do a delicious mixed green veg, though I can't recall the cals but it can't be high. (I stock up and freeze whenever I can get to a supermarket. Nearest one to me, here in a very rural part of the far north of Scotland is 50+ miles away so I can't get there often.) Or, cheaper, the ready-made carrots & swede that various companies do. Nearer home I can buy a brand called 'Mash Direct' in a local ( 10+ miles over hills!) shop which does a wonderful mashed turnip, as its called here in Scotland and in Northern Ireland where Mash Direct is based, which you'd probably think of as mashed swede. It's so low in cals you could eat a whole pack without worrying. I have half a pack and allow myself a pat of butter through it and it's still a very lo-cal option. They (Mash Direct) also do various other mash variants, plus some very delish veggie burgers: I'm not normally a fan of veggie burgers at all, but these are excellent. I have them with their mashed turnip (swede) as a side and the whole meal is well under 300 cals, yet very filling. If you can't find Mash Direct in a supermarket (no idea whether you can or not, for aforementioned reasons) you might find them in one of those branded local shops, Mace or similar, which is how my local shop manages to get them, I assume, via their delivery van. Well worth looking for, anyway.
Hope at least some of these ideas help.

I really like the weightwatchers frozen meals - particularly the ravioli, chicken pasta bake and lasagne. However, they're only good if you cook them for at least an hour - the instructions say 40mins but then the sauce is really thin and watery! They're all about 260 calories so are great with salad and I tend to follow them up with a nice big protein shake Oh and they're only £1 in iceland!