Rely was launched by OSB Group on 12 November after a pilot involving 50 brokers. The lender targets all landlords from first-time right through to large-scale professional investors.

The Mortgage Brain signing lets brokers access Rely’s full range of buy-to-let products.

OSB Group group intermediary director Adrian Moloney (pictured) said: “This collaboration brings together two businesses united by similar values with a focus on enabling brokers to do their best work.

“Through Sourcing Brain and Criteria Brain, Rely can offer brokers even greater accessibility to our data-driven lending platform, helping them find solutions faster, manage risk more confidently, and deliver exceptional outcomes for their clients.”

Mortgage Brain sales & marketing director Neil Wyatt said: “Mortgage Brain has enjoyed a respected and mutually supportive relationship with OSB Group for many years and so this partnership is a natural fit.”

The launch of Rely means OSB Group brand Precise will focus on residential and bridging, withdrawing its buy-to-let homeloans. The Kent Reliance for Intermediaries brand will also be retired.