Hailing a taxi cab... would she strike a pose/ wave her hands/ or just plain whistle? After all anyone can whistle... they say everyone has got their own unique way of hailing a taxi. It is like a thumb print. Unique to you. People watching around Baker Street today it seems to fit. Everyone waves in their own way. Here’s mine in the foto.
There was a great show at the Fringe last year - what would Helen Mirren do? She would probably have her own driver and not need the taxi cab in the first place!