Matron normally keeps a pleasant if impersonal demeanour, though she is occasionally irritated by Archer who tries to wind her up with deliberate awkward questions or calling out the inconsistencies and hypocrisies of the system.
She is also the one who screens the mail before giving it to the inmates, as seen when Archer's Fyodor Dostoyevsky novels are confiscated, and also when Toyne asks her to read his letter informing him of his wife's death, to which she responds "I've already read it." (Her flippant response was due to her mistakenly thinking that 'Candy' was just a household pet that had died).
The Matron's name is 'Miss Biggs' in the script, though it is not mentioned in dialogue or credited within the film.
"Your feet are disgusting, Archer..you're impudent and foolish. I know of vegetarians who don't eat meat, but they doesn't stop them from wearing shoes!"
In the BBC screenplay, Matron is portrayed by Bay White.
White's portrayal is an older, slightly more reserved Matron.