He said: "Here is a great opportunity for brokers to branch out and help those who need alternative lending solutions.
"Specialist lenders play a crucial role in providing for these borrowers and as this sector continues to expand, we hope to see more brokers take advantage of these opportunities and help these customers find the best possible lending solution."
On UK Finance’s 'balances outstanding' table, Lloyds remained at the top despite a one per cent decrease in book size.
A seven per cent increase in balances outstanding for RBS pushed it past Barclays to become the lender with the fourth largest mortgage assets.
UK Finance’s smaller firms, those with less than £50m of lending, did not feature on this table.
rachel.addison@ft.com