The chairman of support services business Carillion is stepping down from the board of Saga Group.

Philip Green has resigned from the board of the over 50s travel and services group and his position as senior independent non executive director.

He will be replaced as senior independent non executive director by National Trust deputy chairman Orna NiChionna, one of Saga’s current non executive directors.

They both joined the board during the Saga’s IPO in 2014.

The changes will be effective from March 31.

Green said: “I have decided to stand down at this time, after almost three years, as I’ve been asked to chair another business and I need to be sure I have the time to do this.”

Saga chairman Andrew Goodsell said: “I’d like to thank Philip very much for his contribution to the Saga board during its first three years as a listed business.

“Given the opportunity that he has been offered, I fully understand the rationale for his decision. We wish him continued success in the future.

“I am delighted that Orna has agreed to take over from Philip as senior independent director.

“She has a good feel for what we do as a business, our values, and what’s right for our customers, and she has made a strong contribution during her time on the board.”

NiChionna is also senior independent non executive director and chairman of the remuneration committee of Royal Mail and chair of client service at management consultancy Eden McCallum.