These are mortgages available for UK citizens who are living and working abroad.
If you own a UK property and are working abroad you can apply for a residential mortgage, even if this property is to be let for a few years until you return.
One of the typical problems in recent years has been that lenders have tended to limit their maximum loan to value (or 'LTV') to 75/80% where expatriate status is concerned. Some lenders now allow loans of up to 85% of valuation, albeit on potentially less attractive terms.
However if a family member is to live in the property as soon as the mortgage is taken you may be able to borrow up to 90%, or possibly even 95%, of the property value.
Employment & income references will be requested by the chosen lender. These can normally be dealt with by fax.