Remote job with an international organisation in the Netherland while working full time in UK

Hi, I'm currently working full-time in the UK on a Global Talent Visa. I was offered a small part-time job working remotely as a social media manager for an international organisation based in the Netherland. The job has no fixed time but rather they will pay an hourly rate. Each month I just sum up how many hours I have done, and they will pay me accordingly. I don't expect to earn more than £100 or so per month and this job does not interfere with my current job. I have not accepted their offer nor signed any contract yet because I'm unsure whether this has any tax implications in the UK? And if it does, how is the tax calculated or processed? Could you please give me some advice on this? Thank you

Hi,

You can see guidance here:

Tax on foreign income

Thank you.