We had the best funded pensions until 1997, when Gordon McRuin decided a £7bn a year tax grab wouldn't be missed, so pensions have lost income and growth since then which adds up to about £200bn or upwards of £10,000 per pensioner, which the governments have just pissed away and we now have the worst funded in Europe.
The is why McRuin introduced workplace pensions, where he had stolen the legacy that people expected from their investments, not only in this tax grab, but also his disastrous economic policies. The workplace pensions won't provide an adequate pension for the vast majority.
Best thing I did was opting out of Serps as it was progressively neutered and finally scrapped as part of the minimum £140 per week this government, so at least I got an invested lump of money from this. The worst thing I did was invest a lot of money over the years into a pension, to see a large percentage disappear in real terms over the last 15 years, the only people that have done well have been financial
crooks advisers with their commissions and fees. I did look in the early 1990's at buy to let and should have gone that route I would have been much better off.
Biggest lesson to me is invest tax paid money, so you are in control and if necessary you can move it outside of the reach of the bunch of crooks in Westminster.