I came across this change to USP/ASP rules introduced in the Finance Bill 2007. Basically there is no automatic movement of funds from a USP to an ASP at the members 75th birthday. I suppose this was inevitable given the introduction of a minimum income limit for ASP.

16. Paragraph 11 inserts new sub-paragraphs (6) and (7) into
paragraph 11 of Schedule 28 to FA 2004, which introduce new
provisions for members of registered pension schemes who
cannot be traced by their 75th birthday. Paragraph 11 of Schedule
28 provides for the conditions that apply for sums and assets to
become held in an ASP fund on the member’s 75th birthday.
Funds that were held in an unsecured pension fund immediately
before the member’s 75th birthday are treated as becoming held as
an ASP fund when the member reaches age 75. The changes
introduced by paragraph 11 of the Schedule will mean that for
HM REVENUE AND CUSTOMS FINANCE BILL 2007
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SCHEDULE 19
members that the scheme administrator can not trace by their 75th
birthday, their funds will not automatically be treated as
becoming held in an ASP fund at that point.
!” New paragraph 11(6) of Schedule 28 provides the conditions
for funds to become held under the separate provisions for
untraceable members. These are that a scheme administrator
has taken reasonable steps to trace a member and has been
unable to find them. There is also a requirement that no part
of the funds in the arrangement were treated as being
designated into unsecured pension, other than by the
operation of paragraph 8(2) of Schedule 28.
!” New paragraph 11(7) of Schedule 28 provides that where the
conditions of new paragraph 11(6) of Schedule 28 apply then
the sums and assets in the member’s pension fund will not
become held as an ASP fund on the member’s 75th birthday.
Such funds having previously been designated into unsecured
pension by virtue of paragraph 8(2) of Schedule 28 to FA
2004, will effectively remain in suspense unless the member
is subsequently traced. While the funds remain in suspense,
any payments from the fund will be unauthorised, because
they are not within one of the forms of benefits set out in
Pension rule 6 in section 165(1) of FA 2004. Where a
member who was untraceable at age 75 is subsequently
traced, then if their funds have not, within six months, been
used to purchase or provide a scheme pension or annuity,
they will at that point be treated as becoming held as an ASP
fund. The ASP provisions, including the minimum income
requirement, will then start to apply.