UK citizen but reside in other country for work- BTL mortgage interest has skyrocketed

Hi There,

Just wondering if anyone has experienced something similar, I am a UK citizen, still paid through the UK via the company I work and pay all my taxes in the UK, but I have an overseas address for work purposes, I provided all this information to the broker and I was stunned at the interest rate that came back to me? 2% higher! Credit file in perfect order and salary has increased since my first mortgage. Anyone dealt with this or worked with a broker who has experience in this area?