The Yorkshire is the second largest building society and has rejoined the CML. It was the tenth highest volume mortgage lender in the UK in 2010 and has over 3.3m members, assets of approximately £33bn and 224 branches.
OneSavings is a hybrid mutual bank seeking “to promote core values of treating customers fairly and offering long term sustainable value for money but with the capital advantages of a bank”.
The bank said: “The ethos of value and personalised service is at the heart of everything we do.”
State Bank of India UK launched buy-to-let mortgages in the UK last year and has emerged from a parent company dating back more than 200 years.
The bank is now looking to expand its range of mortgage products into the residential sector in the coming months.
The CML has also added an associate, Connells Limited. The firm now operates 481 branches nationwide and offers residential property sales and lettings.
The firm also offers new homes, mortgage services, conveyancing, energy performance certificates, surveying, asset management, land and planning, receivership auctions and relocations.
The CML now has 111 members and 88 associates.