The Nationwide Pension Fund has appointed BESTrustees to sit as an independent professional trustee on its board.
The appointment to the building society's defined benefit fund was effective as of 1 July, and followed a competitive tender and interview process.
The professional trustee firm is represented by Catherine Redmond, who sits alongside chairman Pete Wilkin, two other employer-nominated trustee directors, and four member-nominated directors.
She replaces Philip Whittome, who left at the end of June at the end of his normal fixed contract period after six years in the post.
Nationwide head of pensions Ian Baines said: "Strong governance of the fund and the focus on our members' interests are very important for Nationwide. We undertook a thorough review of the market and were very impressed with BESTrustees.
"We look forward to working with them in the years to come, developing and implementing proposals on medium- and long-term strategy."
BESTrustees chairman Alan Pickering added: "Being selected by such an organisation as Nationwide, and particularly as a result of a highly-competitive tender and interview process, is especially pleasing."
The 30,000-member scheme has two sections - Nationwide, and Cheshire & Derbyshire - with an estimated combined actuarial deficit of £572m as of 31 March 2017.
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