The Pensions Advisory Service received a record 1020 calls to its women's helpline on the first day of operation.
Chief executive Malcolm McLean said: “We have been absolutely swamped. We had 1020 calls on the Monday we opened, in addition to the 400 calls on the general helpline. That continued the following day....
Respondents say they should only be required in certain situations as the system is not broken.
Smart Pension has absorbed more than 6,500 members from the Corporate Pensions Trust (CPT) after its trustees decided not to apply for authorisation.
The Defined Contribution Investment Forum (DCIF) has reappointed Vivek Roy as chairman for 2019 following a vote at its annual general meeting last November.