I don't understand why people are using the fact that both parents work for not cooking meals for their kids.
Both my parents worked, and the only time we ever had ready meals was very occasionally when my sister and I badgered my mum.
Boosiesh -I want to pick up on what you said here.
When I was growing up ready-meals were a rarity too, although processed foods (e.g. fish in breadcrumbs, the ubiquitous crispy pancake, etc) were commonplace. No one we knew bought lasagne or fish pie though, everyone made them. This was normal and lifestyles of the time reflected the fact that in most households an hour would be allowed for food preparation/cooking. As a result fewer things were packed into an evening/week than is the case today. There were fewer clubs for children and they were usually in walking distance or parents took it in turns to take several children. Parents (especially the mothers) had fewer leisure activities of their own.
The world is different now. Children have more homework than ever and attend more clubs. We are told we need hobbies and activities to be well-rounded individuals. In among all this we still have to shop, clean, do laundry and cook. The appeal of a 10-minute meal you can pop in the microwave when you've already done a 10-hour shift, have to listen to your youngest DC read for 10 minutes, help the elder one with their maths homework, get the laundry off the line which you hung out this morning before going to work, call your mother, attend your spin class...
Working parents in the past had just as many essential things to do but fewer leisure activities. Today we could cut back on the leisure activities but if we do that we are led to believe we are somehow inadequate or boring, thanks to more cultural messaging. It's unsurprising many would prefer to scrap cooking than scrap a round of golf or visiting a friend.
Maybe our expectations are unrealistic and need to change but I can't see many volunteering for that while 99p meals remain available.