Please be careful. I have been a UK expat for a number of years, have a couple of properties rented out in the UK and have an accountant working on the most tax efficient way to preserve my income.

Being non-resident allows you to request not being deducted at source, which is the case with me, so I receive my rental income on a gross basis.

HOWEVER I must declare this income when I fill out my self-assessment form since all UK originated income for non-residents is fully liable to UK tax. I can then offset my mortgage loans, "wear and tear', repair bills and agnets fees against this to make it more tax efficient.

I reiterate however that for all expats UK originated income is fully taxable.

I hope this clarifies the matter somewhat.