It's definitely true. I've noticed a real difference over the past 20 to 25 years but I think this is not just limited to the UK. The increased uncertainties of modern life, the anonimity of much of it and the endless rat race all take their toll..
And the TV at present is absolutely the total pits. 'Celebrity Love Island'? Frontal lobotomies advised ! ( )
The UK is a materially richer place these days (well, for the majority it is I think) but not necessarily a happier one. I read the other day a statement that we have become as a nation much more like the Germans in this respect. An interesting observation..