Well it's sort of true you pay tax relevant to where you are resident, but you DO still pay PAYE tax in the UK (assuming you are employed, not self employed), then via the dual taxation agreement, you offset that payment against your liabilities in NL. It's a headache, but doable DIY if you have the inclination. Some companies used to use some sort of a PAYE waiver for foreigners, but I've not heard of it receitly. NI reciprocity is a grey area I never fully understood. I believe the ehic card is still being honoured though, so make sure you have one of those.
New job, or a continuation from 2020, or two passports? I'm still seeing some UK based job ads (not necessarily aviation), which invite applicants with EU passports.
Last edited by Time Traveller; 25th Feb 2021 at 13:48.