i'm UK citizen with British Passport. My home is here in the UK... but I have not been in the UK for more than 183 days for this last Tax year.
You'll be treated as non-resident from the day after you leave the UK if you can show:
you left the UK to go abroad permanently or your absence and full-time work abroad lasts at least the whole tax year
your visits to the UK are less than 183 days in a tax year and average less than 91 days a tax year over a maximum of four consecutive years.
You are still a UK resident for tax purposes.