This made me go vegan: www.landofhopeandglory.org
The ready meals are ridiculously expensive, as are a lot of the substitutions. But I'm experimenting with pulses/beans, and a lot of supermarkets now do their own alternatives which are much nicer.
I cook a meal every night from scratch, takes around 30 minutes, and I make enough to take for lunch the next day too.
Cheese was hard for me, I loved it, so I've just stopped eating it, the replacements are awful and all taste the same!
It's far more the ethical side than dietary, but I also have IBD which is currently in remission (yay!). And I've felt a million times less tired since stopping milk and eggs.
As PP have said though, it goes further than what you eat, which can be a challenge, but worth it in my mind.
I am a believer though in each to their own, so I don't judge other peoples choices (As long as they don't judge mine!)