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I'll have one more guess then - are you at St. Johns?

No. (20/25)

But it's possible you've hit the right track here. St Johns isn't in box F7...

Oak Park?

It's not Oak Park, but you're definitely on the right track... (21/25)

Denham?

No. (22/25)

Just a clarification question against the rules:

When you state "I am at a station..." and we later deduce that you are within a given grid reference on the map provided, are you actually at a station that would lie within that grid reference? If not, then surely the rules have not been adhered to - you are actually at a station elsewhere but the name of it is contained within the grid reference. Just want to make sure that I'm understanding the rules correctly here!!

I have honestly no idea here! Those 2 are the only two I can find! Unless it's Lewis, instead of Lewes

I mean the writing is in that grid reference! You can't really say the station is in that grid reference if it's not actually on the map...

Any questions to do with grid reference are to do with the name of the station, because that's what I clarified was on the Tube Map.
Any questions to do with the station itself are about the station itself.

And no, it's not Lewes. (23/25)
Let's see who knows their short named stations...

If not, Roydon

Not Roydon. (24/25)

I'll let Ham go, because it's not a station as far as I know.

I really need a clue!

(I'm getting desperate now)

Roy?

Not a station either!!

There's a number of databases of stations, have a look for syllables...