Originally Posted by
Panda4
I agree - a bonkers rule

it's so completely bonkers that it's not in fact a rule at all:
Originally Posted by Executive Club Terms and Conditions
14.1. Changes to bookings for Reward travel on flights operated by British Airways or Airline Partners are permitted only in respect of date, time, class of service and (subject to Clause 14.2.) route. Such changes may only be made by the Member or an individual nominated in accordance with Clause 3.13. If more than one Avios & Money price option is available for a British Airways flight, it is not possible to change the price option chosen by a Member after a booking has been made. All permitted changes are subject to capacity limitations and may not be made after the time 24 hours prior to the scheduled departure of the first flight in the Reward travel itinerary. A fee as specified on ba.com may be payable for each permitted change. For the avoidance of doubt, name changes are not permitted.