Looks like this is a pretty good article on UK taxes:
https://www.expatica.com/uk/finance/taxes/self-employed-tax-uk-758269/ which would be my biggest "worry" when going freelance. I did for a while and I hated having to do all the paperwork, although the UK is much easier than my country when it comes to this stuff.
You'd have to insure yourself and pay your own pension contributions, so make sure the money you bring in will still be a good wage after you've paid for all of this.
If you have a dedicated work room you might be able to deduct some of your electricity cost, cost for the internet, etc from your taxes.
You'll also be responsible for all work equipment you'd need, but again, that can be deducted from your taxes afaik.
Positives:
- you can work from anywhere
- you can choose your clients
- salary is not limited, especially if you have experience - you can set your own wages
- Work hours are up to you to define - wanna work 5pm to midnight? Who's gonna stop you?
- you can work as much or as little as you want (subject to affordability of course)
- Take as much holiday as you want to (subject to affordability of course)
- You will not have a classic boss, the boss will be you
Negatives:
- No statutory holidays and the associated pay
- Paperwork
- Less workplace protections, as you'll be your own company
- Clients might not pay you / pay you on time so you'd have to chase them, and might even have to sue them to get your money
- You will need to become proficient in contract language
- You will need to be available to your clients at times when you'd rather not be - i. e. answer emails and calls eve while on holiday for enquiries into your services
- Your time management will need to be on point, both for your clients and for the tax offices