I wouldn’t make a habit of it, but plans do change and BA aren’t likely to make a fuss unless it becomes a pattern.

Unlike Lufthansa, who decided to fight one of their HON Circle members in court and lost:

Lufthansa court case - Skiplagging now legally allowed (*conditions apply)

Honestly, the thread is worth a read, as it involves a Flight Attendant snitching, LH digging their heels in, trying to back out when they realised they were going to lose and the Judge ruling against them anyway.