lowrib Or:
You take out insurance while earning a massive salary (which I don't, by the way), to make sure that when things go wrong you don't have to rely on the whims of politicians.
You don't live in central London during the good times. Instead, you live more frugally in zone 3, and invest the savings.
You then take out an mortgage offset against your savings account in the good times, which enables you to repay as much as possible - thereby making the bad times bearable.
And of course, if things go really badly wrong, benefits should be there to help you get back on your feet. However, you understand that they are limited and temporary. You don't dream of being on unemployment benefit for more than a year.
Soon, after sending off dozens or even hundreds of CVs, you get interviews, and get a job. If that doesn't work, you start your own business, maybe starting out on eBay or Amazon marketplace so there are no startup costs.