We took our granddaughters to Peppa Pig World last summer, it was fantastic, thoroughly recommend. We stayed at Butlin's Bognor Regis for 5 days as it's relatively close to PPW and thought it would be fun. It would have been brilliant, but for the other holidaymakers there. The swimming pool was great, we all loved it, but there were soiled nappies left on the floor in the changing rooms, sanitary towels left behind toilets. The restaurants served decent food (Harvester style) but you had to sit amongst the previous diners' leftovers, mind where you stood for food debris on the carpet, clean the highchair before putting the 2 year old in (I always carry wipes.) I would never leave a table in a mess, people have no manners. The big indoor soft play area was great, but the section for little ones kept being invaded by feral kids much older, throwing the shapes around and jumping on the little ones, no parents to control them. The playground was good, but again ruined by thuggish kids blocking little ones' way on the climbing frame, twisting the swings in the air, generally being a nuisance. No parents in sight. The main entertainment area was huge, shows, mini funfair, arcade, restaurants & bars all in a massive marquee, but parents sat getting drunk while their kids ran wild.
Basically, the great British holiday still has the same components as it's always had, it's the not so great British public that has changed. It has nothing at all to do with low income Vs wealth, it's the mindset that has changed. Control your children, don't swear, don't get drunk when you're in charge of small children and babies in prams, clear up after yourselves, if bins are full find another one, be respectful to yourselves and others, be polite to staff and don't be rude (I can't believe that in some establishments now signs remind customers of this.)
There were three generations of us on holiday, we made the most of it but all said we wouldn't return any time soon. It's such a shame because on paper the holiday provides everything you could possibly want with a young family.
Standards have dropped so far in this country, you notice it everywhere you go. I don't know the answer, but I despair for my granddaughters' future.