I've been using HelloFresh and Gousto when they had promotional codes for signing up. I think they're good value with the introductory offers (HF is £15 for three meals for "two" people - we got 3-4 meals out of each of them; Gousto is £14 for four meals for two people, and the portion sizes fit the description). So not super cheap, but considering everything is very straightforward to cook and the recipes are something different and exciting, I found it worthwhile. Certainly saves on thinking and shopping. The packaging waste is annoying, but HF did inform me that they collect all the packaging if you request it. Not sure if the fuel used to drive the truck to collect the packaging makes up for it being reused...
Anyway, PM if you want some sign up codes. Gousto gives you 60% off your first box (and I get £15), and HF gives you a free first box and I'm not sure what I get. Just make sure to cancel the subscription after the first week so you're not trapped paying £35 for three or four meals!