I am slowly making a dream cast list in my mind!
Monica, who is supposed to be tall and indomitable and rather cold, I think could have been played really well by Emma Thompson (admittedly perhaps a few years ago as Emma is in her 60’s now)?
Taggie I always saw as a young Helena Bonham Carter, given that description of her “cloudy” dark hair.
Rupert - if we’re turning back time, I always assumed that JC had a young Robert Redford in mind to add to the honed muscled riding bodies and clipped drawls of the likes of Andrew Parker-Bowles!