Itanisa

Hello. I am a UK resident on a BRP (sponsored by my emoloyer) and used to live in the UK and work for the NHS. I have moved to the Netherlands and started working remotely for a couple of months. Now I became a resident in the Netherlands and want to work remotely for the NHS for a longer period of time ( almost permanently in NLD with few visits to the UK ). I still have a UK address. I need to know the legal requirements for my case in terms of income taxes, council, National insurance… and if my employer has any obligations as well. Thank You