So I have two...completely unrelated thoughts
First, i know they're worried in-universe about summoning Jalter but I think it'd be really funny if we got the following sequence:
Jalter: *is summoned*
Jalter: What?
Taylor: do you see that ship over there *points at the Argo, with all the Servants on-board*
Jalter: Yeah?
Taylor: I don't want to
Jalter: ...
Taylor: ...
Jalter: *grins* you know what Master? I think we're gonna get along just fine!
Second is more related to London, because if there is any figure I feel Taylor should know, understand, and respect/get along with it should probably be Frankenstein. That said, going off the fact that she canonically never had a name, doesn't like being referred or appended to by her creator's name, and Taylor's slip with Asterios here I figure she might actually think to ask what she herself wants to be called.
which is why i'm now sitting here wondering what that might be. her common nickname is 'Fran' but that kind of just feeds into her annoyance...the Monster in most modern adaptations usually goes by Adam, so maybe Eve? I don't know, what do you cats think?