Asset Consultant Watson Wyatt's three-year contact to advise BT Financial Group took effect in late July.
In June, BT terminated its relationship with Intech.
Impartial and independent advice was a key factor behind the manager's decision to replace Intech with Watson Wyatt.
"We were attracted to Watson Wyatt because it was a global firm that offered truly independent advice. Watson Wyatt will play a significant part in our portfolio," BT Investment Solutions head Stewart Brentnall said.
"There are two parts to our contract with Watson Wyatt. We have access to its global research as well as its manager database."
Previously, BT accessed its international research through Intech's partnership with offshore company Rogers Casey.