This topic might have a better name.
Primarily refered to as "Hannah Haisman" on releases ft. Lethbridge-Stewart
Talk about it here.
Hannah Hatt, also known as Hannah Haisman, is the granddaughter of Mervyn Haisman and the executor of the Haisman Literary Estate. She appointed Andy Frankham-Allen as Creative Director of the Haisman Literary Estate. She also licensed the character of Alistair Gordon Lethbridge-Stewart directly to BBV Productions for the The Brigadier Adventures audios. Also a writer in her own right, she authored The Last Secret.