It’s up to you whether you decide to travel with or without travel insurance. If you choose to go without, be aware that you will need to take care of all potential expenses yourself. This would include medical expenses, which can easily add up to thousands of pounds.
You may already have travel insurance included with your bank, tour operator, or flight provider. We would always suggest that you double-check your cover (especially medical), when it comes to these policies.
Some countries also have reciprocal health agreements with the UK, such as the GHIC in Europe or Medicare in Australia. Note that there might still be additional fees or charges alongside these.