*peers closely at this for some days* I have only one comment; it's just a passing comment, I don't think it affects anything, but perhaps our learned friend could clarify:
Playing a Zone 1-6 Travelcard explicitly revokes everything northwest of Moor Park, which is fine, but I'm interested in the position of the Chesham spur at peak times. How does this affect the freem around Aldgate East? Just asking.

[Watty,PW] Oh dear, Paul, I do believe Watty has spotted the flaw in your otherwise excellent and cunning plan. The freem count will be negative at Aldgate East as Watty surmises and so Finsbury Park will be in close jeopardy, and thus unplayable for three moves minimum. Darned close though.

What is it about.

[Scuty] Is it not obvious ?

[Blob] I think Scuty was making a (correct) statement, rather than asking a question.

...and isn't it weird that it took around 20 months for poor Scuty to get a reply?

But it was a quality reply, Chalks ;o)