Character idea for my Torchwood/Beatles adventure

Miss Poppins, a Kingsman agent who seems to have an uncanny knack for being at the right place at the right time. First name may or may not be Mary, she never uses it.

( spoilers! )

Tentative Character List

This is the tentative character list for the Torchwood / Help adventure, from discussion here and elsewhere

Captain Jack Harkness of Torchwood
Doctor Carol Lake (archaeologist and ethnologist)
Adam Adamant, Gentleman Adventurer
Miss Poppins, allegedly a Kingsman agent - look here if you REALLY want to know - https://www.bbc.co.uk/programmes/profiles/xCgpqKWg8nj5BS2LJ6DRV0
Professor Bernard Quatermass, Scientist - from Quatermass and the Pit etc.
Group Captain Lionel Mandrake RAF, Military Liason - suggested by Doctor Strangelove but nuclear war is hopefully a little less likely in this adventure

Reserve characters
Miss Georgina Jones, Adam's Plucky Assistant
At least one other, possibly Sgt. Benton before he joined UNIT