There were 1,200 buy-to-let mortgages in significant arrears of more than 10% of the balance, a 12% increase on the first quarter of 2018.
In 2018 the proportion of buy-to-let applications to that demographic rose by 5.43% compared to 2017.
The products are available to expats with a minimum income of £40,000 for employed and £60,000 for self-employed. Products are on a capital and interest, part and part or interest-only basis.
Other areas to see rises are Yorkshire and Humberside (1.34%), the South West (1.24%) and West Midlands (1.24%).
The RLA said only private landlords accredited by the council can obtain a longer HMO licence, even if they are able to display their qualities in other ways.
The product comes with offers free legal and valuation fees on standard remortgages in England and Wales, while for Scottish cases a contribution of £150 is available.
Searches for UK property by overseas buyers have grown steadily since before the EU referendum to account for 6.2% of all activity on the portal in the first three months of this year, compared to 3.6% in the same period in 2016.
Gates will work with the Sirius team to maximise opportunities its core markets of High Net Worth individuals and developers.