one of the controversies over the 'the iron lady' was the portrayal of thatcher's dementia. i have no idea if it was an accurate picture of dementia, i do know that i did find myself feeling somewhat sorry for the old dear and i never thought i would say that.
jonathan aitken has revealed (because like all good tories he keeps secrets) that at a dinner party mrs thatcher did not know that david cameron was the prime minister. for aitken this is an example of how bad her dementia is.
personally i think she is just embarrassed by the preening toff and prefers to ignore him.