Agree that tax credits probably didn't help, as it gave the employers an excuse to keep wages low. And they have never gone up. Many people have not had a wage increase in over a decade.
I was on £19K 25 years ago, and know some people who aren't on that now! in addition, I could walk from one job into another 25 years ago. In 1991, I applied for 7 jobs, got 6 interviews, and got offered 5 of the jobs.
One employer offered me 5% more salary when I took the job with another employer. (I took my first choice, as it was 20 minutes walk from my house, and the other was 2 hours travel a day on public transport.) In 1993, my wage went up 10%..
As I said, I was on £19K as a P.A. in the south in the very early 1990's. My first house was £33K. (in the mid 1990's.) I know several people now who are on less than £19K and the same house is valued at £160K. They've got no chance.
House prices have virtually tripled, (excluding London where they have gone up even more!) and wages are probably about a THIRD of what they should be. Do the math; no wonder most people can afford fuck-all, people are going to food banks, many people need help from tax credits, most people have no savings, most people can't afford to get on the property ladder, and many people are in debt.
Much of society is poorly paid and disillusioned; no wonder the Brexit vote won. And I agree we need a return of unions.
Someone said (on page 1,) that it's like this 'because we allow it.' How the heck are we meant to stop it?! 
Something went horribly wrong, and it was waaaay before Brexit, and even before the 2008 crash.
Society is fucked. And it's not just in the UK either. Taking inflation into account; wages should be around £20 an hour now (to be the same as they were in the late 1970's, the 1980's, and the early 1990's.) And a house that cost £33K in 1993 should cost around £58K now, yet it costs anything from £145 to £160K for the same house.
As I said, it's not hard to see why society is fucked, many people struggle furiously with finances, few people can get on the property ladder, and few people have savings.
I feel for Millennials I genuinely do. The majority of them will never buy a property, especially as quite a few of them have parents who are from the disillusioned and unfortunate 'Generation X,' who struggle to make ends meet, and can't help their 1990's born children, as they barely have enough money to look after themselves.