Thompson will assume responsibility for the day to day running of all ULS products and services, with a particular focus on extending the firm's relationships with mortgage providers.
The appointment enables Nigel Hoath, the former managing director, to focus on the strategic growth of the group in a new CEO role.
Thompson was reshuffled within Legal & General on 7 January this year to the insurance role after a reportedly chaotic restructuring at L&G, which also saw several redundancies.
Stephen Smith director of housing and external affairs at L&G said at the time:
"This is the January transfer window and our star player has moved up to a bigger team."
By the time he left, Thompson had increased the mortgage market share from 9 to 28% since he joined the club in 2007.
Thompson has worked in the financial services sector for 28 years following senior roles at Legal & General, St. James's Place, Paymentshield and Winterthur Life.
Nigel Hoath, CEO, said:
"We are delighted to appoint Ben as the managing director of ULS. He will concentrate on improving existing products and selling these to new clients. We are confident that his excellent relationships within banks, building societies and other mortgage providers will enable us to further broaden our client base. Ben's appointment brings additional breadth and depth to our management team as we prepare for the next stages of growth."
