I think it’s fair to say a lot on middle-class people are struggling now as a delayed consequence of the housing boom in the mid-2000s.
As mentioned, I worked at a bank during this time, and literally every other customer who came in to a branch was persuaded to re-mortgage their house. It was like millions of everyday people in their semi-detached house got a £30, 40k cash bonus.
Nowadays everybody is paying what their house is worth, with no opportunity to get a cash injection (other than additional debt), so they are squeezed.
It was such a short-term view, but the people cashing in at the time, and the banks, didn’t care one bit. Pure greed.