As folk who've read through the comments will have realised, there are huge regional differences in F&C pricing, it's not just the massively higher prices of the ingredients that are at fault! [Thinks rents and business rates . . .]
The OP's phrase "And however much fish and chip shop owners wring their hands" is, sadly, delusional, why would those shop owners make such drastic increases and instantly reduce their customer base if they didn't have to? Have you tried running a business? No, thought not.
Oh, and did someone say making those meals yourself (or from a s'market) would be cheaper and healthier? Well, yes, but the SAME APPLIES to Indian & Chinese (s'market versions are fine these days) and most certainly to Pizza, ridiculously expensive from a takeaway, given that the box costs more than the ingredients -- and from some well-known chains, tastes slightly better!