So, the existing booking conversion rate for bookings made before 30th December for travel after 31st March is 13.35x (ie 20 old TPs becoming 267 New Tier Points).

Lifetime Gold increased from 35,000 to 550,000, a multiple of 15.71x.
GUFs increased from 2,500 to 35,000 and 3,500 to 50,000, a multiple of 14-14.29x.

Stating that "Customers who already hold bookings for travel after 1 April 2025 will be awarded Tier Points based on a conversion of the existing method. Any existing bookings will earn proportionally the same number of Tier Points, or more, as they would today" is not quite true...