There are plenty of younger working families currently on mortgages of 7% or so, on properties of between £100,000 to. £300,000, on salaries between £20k and £30k, due to struggling to raise the deposits required.
Not that incomparable to a 12% mortgage on £5000 a year, on a £12,000 to £14,000 house...
A lot of the 2-4% mortgages will only be unlocked if you have a deposit of around 30%. That's about £100,000 cash for a desposit for the average property in the South-East.
And that's not taking into account the millions of younger working families who can't afford deposits like that and are privately renting on about £1,500 pcm in second/third homes owned by Baby Boomers and can only dream of owning their own home.