As part of the agreement, Paradigm member firms will be able to access the lender’s range of residential and buy-to-let mortgages.

The building society offers a range of products including Joint Borrower Sole Proprietor, family assist, later life products and expat buy-to-let offerings.

Advisers will also benefit from the society’s online intermediary portal and access to two key account managers who cover the Midlands and North, or the South.

John Coffield, head of mortgages at Paradigm Mortgage Services, said: “At Paradigm we always want to work with lenders who push the envelope, and we are therefore very pleased to be bringing the Buckinghamshire Building Society to our members.

“The Buckinghamshire clearly look for specific customer needs in the mortgage market and tailor their proposition to this, with a range of unique and highly targeted products available in both the residential and buy-to-let spaces.

“We know that many of our member firms will have clients for whom these products are undoubtedly needed, and we are looking forward to working with the team at the Buckinghamshire to highlight their offering our advisers.”

Tim Vigeon, head of lending at the Buckinghamshire Building Society, added: “This is a great time to be joining Paradigm Mortgages Services; with our innovative mortgage proposition including our flexible and bespoke underwriting approach we feel we can provide extra support to Paradigm members.”