I'm guessing that there is a much smaller proportion of overweight people in Finland compared to the UK!
It is possible to buy good quality, wholesome food inexpensively in the UK - we have much more diversity of supply with better quality than a generation or so ago, post-war - but it requires either time and/or money, plus knowledge (of where to go [often in multiple places, like "old-fashioned shopping" before supermarkets], what to look for and what to do with it when you get it home).
Tinned food is often very good value, and often overlooked, it usually retains its vitamin and mineral contents well. About forty years ago I met an old boy in the Scottish highlands - he told me he preferred tinned peaches to fresh ones, which I initially found hard to understand - until I realised that he probably had not seen many fresh peaches, and by the time they'd got up to the Highlands they would perhaps not be that fresh anyway! Of course, tinned peaches are perfectly wholesome and relatively inexpensive....
We have, despite the popularity of cooking/baking TV programmes, very largely bred a generation (not many home economics classes are now taught in school, for example) that does not know how to cook a meal from scratch and probably doesn't recognise that it can be cheaper and just as easy, quick and often better for you, than processed food (or takeaways, which are nearly always packed with cheap and nasty ingredients and very expensive for what they are).
My teenagers "like" Domino's pizza (they like it for the same reason my then three-year-old daughter knew she wanted a Barbie - before she knew what a Barbie actually was - cunning advertising). Personally I think it's the worst kind of food - delivered, it costs probably ten or twenty times what it costs to make pizza/garlic bread at home from scratch (including the dough).
The food industry in this country has done some positive things, but it also does some pretty cynical things too. I won't start on the topics of food waste and the other environmental impacts of our food supply chains (palm oil anyone?).
Cheers, and good health, W2S