If a double taxation agreement exists between the UK and your country of residence, you may find that your UK employment is not taxable in the UK, but your country of residence (as foreign employment income).
If you are not going to be resident in any country long enough to be classed as resident, you may find your income is still taxable in the UK.
You would need to advise your employer that you have move to another country.
Please take a look at the guidance on residence:
Residence, domicile and the remittance basis: RDR1
and the notes for the statutory residency tests at:
RDR3: Statutory Residence Test (SRT) notes