But our economy is based predominantly on our financial institutions, which as 2007/8 prove, have major systemic problems. The only difference between then and now is that now there is ten times the abound of debt that there was back then, with no measurable increase in productivity or growth.
Personally, I'd suggest getting rid of all debt, followed by getting your wealth into hard assets. Real things you can touch. It really depends on what you amount of money you are talking about. As a last ditch attempt to store value, Greeks bought Mercedes motorcars, because in a failing economy, a vehicle is a commodity that does not depreciate, while a banknote's value changes every day and tends to depreciate.
Other posters have already suggested storing cash at home, for those with the ability to save up a couple of thousand pound over time, it could be useful to have liquid cash while everyone else is standing in lines at ATMs, and being able to drop a thousand pound on water bowser or a generator in a crisis, of fly the family to the mainland at the drop of a hat, or even pay your bills for a month or two if the family looses its income, is an wonderful safety blanket.
As regards pension pots, some of us are lucky to have them, others are already hanging their entire future happiness on the faith they have in some future government facing unknowable financial challenges. What we do know is that more and more people are living longer, less and less people are working full-time, and the pot of money to go around is shrinking and will continue to shrink. The maths is unsustainable, but we have to pretend there is a magic solution, otherwise our government doesn't work.
I believe the government is going to corral as much money as it can squeeze from the populous into the pension system, under the premiss of 'it's for your own good', and then we'll nationalise the pension savings of the nation, ie. the government will take all the pensions and give its citizens promissory notes in exchange. IOUs. Call them pension bonds, we-the-people certificates, whatever. We are seeing this in Poland, the US, etc. Governments learn from one another. So I chose to remove my pension from the stock market and place it in hard assets offshore. I can't stop them trying to take it, but I can make it as hard as possible, and if it's still there in a decade from now, I'll look back at the stock market, or pump it into commercial property or land. But I don't consider my pension pot as an asset, and I'm completely prepared never to see it again. I am not dumb enough to be contributing to a pension plan, and will manage my own savings rather than pay some unaccountable entity fees each year to do BS they please with our meagre wealth.
Back to the penny drop moment when a population discovers their government are cronies or prats. When people realise that the government does not know what it is doing, and cannot be trusted to act in the best interests of the electorate, people stop paying taxes. You can force some people to pay taxes, but you cannot force everyone to pay tax when 50% of the population stop paying for the other 50% to live off their backs.