You made a brilliant call in investment terms!
UK government bonds (also known as gilts) are for all intents and purposes unbreakable. They were introduced in the 17th century as a means to raise money for war, with the aim that the government would pay back that sum after a set time.
The UK government has since the 17th century been in all manner of wars as Im sure you know. Crimean, US revolution, WW1 and WW2. Despite all these seemingly armageddon-proportion events, the UK gov't has never, ever defaulted on a gilt.
In short, your money is as safe as it could possibly be.
If in the unthinkable event that the UK govt defaults, it will truly be armageddon. Frankly nobody knows what would happen, but money wouldn't be much use in such a situation. After all, what good is a bit of paper when the bullets are flying overhead!
(FYI gilts are up massively in the last few days due to market instability... you should have a nice surprise waiting for you if you check their value
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