Henderson has been made Secure Trust Bank’s head of strategic business development and personal lending and mortgages.
Secure Trust has not confirmed whether it will enter the mortgage market, but with Henderson's appointment and job title it looks increasingly likely.
Before joining Kensington Henderson was chief executive of Shawbrook, while he has also held senior executive roles in Barclays and RBS.
Paul Lynam, chief executive of Secure Trust Bank Group, who Henderson will report to, said: “I have known Ian for a number of years and am delighted he has agreed to join us.
“Ian has huge relevant experience in consumer finance and mortgage markets.
“His appointment will further strengthen our executive team and is another tangible demonstration of our commitment to ensuring that our strong ongoing growth is well controlled and sustainable”.
Henderson added: "I have been observing Secure Trust Bank for a number of years - it's a tremendous business.
“I am delighted to be joining at an important point in its development and look forward to working with Paul and his team in the next phase of growth."
Amany Attia, chief executive of parent Acenden Mortgage Servicing Solutions, has been authorised by the FCA as the CEO of Kensington and, following Henderson’s departure, will also take on the responsibility of CEO for the group.
In a statement to staff last week she said: “After much reflection, Ian Henderson has decided to leave the group in order to pursue other opportunities. Ian’s last day was 30 September.
“Ian has been instrumental in leading the highly successful migration of Kensington out of Investec Bank as well as navigating its emergence and re-launch as a stand-alone lender. I would like to thank Ian for all his hard work, effort and dedication over the last year, and wish him success for the future.
“My objective will be to work with all of you to leverage the skills and experience of both Kensington and Acenden to create a leading player in the mortgage market.
“I am very excited by the opportunity before us. We have great people, a valuable shared history exceptionally strong backers and a market in need of solutions. I look forward to working with you and firmly believe that together we can continue to build a great company.”
This is the second Kensington exit announced today, as Roy Armitage also joined LendInvest as head of credit.