Imo, it took Olivia Colman until episode 9 season 3 of The Crown to 'become' HMQ compared to Claire Foy who had nailed it by episode 3, season 1 of The Crown.
I thought Helena B-C 'became' Margaret by episode 4, season 3.
Toby Menzies was Philip straight away. I've just googled Toby & can't believe he's younger than me, I thought he was about 10 years older.
Emerald Fennell was great casting as Camilla & so was Josh O'Connor as Charles.
I really liked the character of Harold Wilson. I wonder if that's true of Wilson being HMQ's second favourite Prime Minister after Churchill. If true I can see why, although politically poles apart from Churchill, Wilson & Churchill both come across as loyal, decent, say it how it is, kind men although they had their faults too.