Which country was prepared?
You cannot prepare for every possible eventuality at government level. You can run simulations and possible scenarios for anything you like but it then comes down to a probability call as to what you spend your money on.
This is true. So any government would be wise to maybe focus its attention on say, the issue which is top of its civil contingencies risk register, both for likelihood and impact.
Which is global pandemic. While you might not prepare for every possible eventuality, you might thinking about preparing for what successive governments' own planning have identified as the biggest risk to the UK.