Yousignup it seems you're spot on with your calculations. I'm not in the UK either but when doing some light math I have come up with similar numbers. I'm four years ahead of you... The reason why we did not start 30 years ago is, primarily, that the times were different and what has now emerged as a problem was only a light distant cloud barely to be seen at the horizon - at least I didn't see it when I was in my twenties. I my case, we also had a different pension system, so thirty years ago I didn't think I had anything to worry about, the system at the time was a defined benefit system, unfunded unfortunately, but I didn't know that. I feel slightly beguiled, fooled, like being offered a piece of candy but realising it is gone, has melted away. The problem with some pension schemes is that they're sometimes underfunded, there's not enough money in them, as of now, so as to cover for everybody who is on them. That's one reason why low interest rates aren't all that great, at least not for pension schemes whose managers find it increasingly hard to earn enough to recoup, I believe I've read this somewhere (probably in the IPE magazine). How much all the other people are saving, now, is not so interesting because you might be comparing yourself with people who don't set aside "enough" to be honest. On January 2 this year, according to Google, the Financial Times ran an article betitled "UK pensions two decades behind on liabilities, growth of liabilities continues to outstrip the growth in assets". That FT article ends with the phrase "...about 1,000 private-sector pension schemes are 'highly unlikely' to pay their members’ pensions in full ...". 
And another article on 22 Nov 2016 in the IPE magazine proudly proclaimed "UK pension funding position 'weakest in Europe', study shows", and that article mentions that "UK pension deficits have spiralled following the country’s vote in June to exit the European Union." I haven't checked up on the source, but IPE magazine seems to me to usually be a reliable source. In any case, yousignup, you're better off doing something now, at age 48, than at age 58 or 68. The best you can do is to think it over yourself, the options, and then decide on what to do. One source to start, I find, could be by watching Robert Kiyosaki on YouTube, explaining what is a balance sheet, it has some grains of truth. You could also for example check out the IPE magazine online, it's aimed for the professionals in the industry, covering entire Europe.