Being a sad individual I went through the opening sequences last night and listed who we know to be in the Slough bunker so far: 
Ariel and/or Jamie.
Rhonda McNeil
Celine (Nun)
Scotty McNeil (Govt employee)
Frankie aka Giraffe Girl/Jamie's Daughter
Dave (Jamie's friend, injured eye)
Female in box (sounds like Rhonda, could be Leanne or Layla?)
Grandmother (Diana Rigg)
Doctor of above
Rhonda's son Spike (injured hands, stigmata?)
General Arnold Gaines (Scottie's partner)
Paula, Jamie's adopted mother (Pauline Quirk)
Monkey (Diana Riggs pet)
Prosthetic limb
Behind Jamie/Ariel during the sofa shot there seems to be a woman in an orange American prison jumpsuit, which could be Leanne or Rhonda and on the other side a, possibly Asian, woman with long dark hair dressed in white/grey.
Still loving the series and hoping the final episode ties up all the themes whilst providing a happy ending. Only bum notes for me have been the pantomime villian style depiction of the Grandmother and the appearance this week of June Whitfield as God, what's that all about!