In this episode, Mum's full name is revealed to be Mabel Ethel Butler.
Blakey: You go and get my grub, Olive. Come on.
Olive: All right, I'll get it for you in a minute.
Blakey: Get my slippers and all.
Jack: Here, don't let him take advantage of you, Olive!
Olive: Oh, he doesn't do that. (Sighs) Nobody ever does that.
Blakey: Mind your own business, Harper. Remember, an Englishman's home is is castle.
Jack: You're not English, you're from Wapping.