Apologies in advance if what I ask is shocking, but : Why do people feel so surprised that Britain might support one of their colonies chosing slavery ? Of course, I totally get that this would cause some scandal in the British society, the British press, even turmoil possibly. But the British governement ? We're talking about one of the deadliest and most cynical colonial empires in History. They began thinking slavery was very bad when their slave colonies got upset and threw packets of tea into the Atlantic ocean, but in other parts of the world, slavery was no issue at all for them.
Now, they might believe this is afoolish move, and try to persuade New South Wales to back down, applying sanctions for example *if* they feel it would be in their interest (for example if British abolitionist IGs are pressuring), but personnaly I found Britain attitudein the AAR perfectly cromulent