In message

, at 03:34:19 on Sat, 19 Jul 2014, Recliner
remarked:
If you look at the relevant page, you can see that Chesham is in line with
other outlying Met stations, that do have trains in the relevant period:

Station Time of Touch In
Chesham 09:10*
Amersham 09:10
Chalfont & Latimer 09:20
Chorleywood 09:15
Rickmansworth 09:20

* Warning: first train from Chesham is not until 0934. You are not advised
to touch in before 0930 or you may be overcharged.

So it's just bad luck, and today's timetable, which has this 24 minute
wormhole. Apart from that, it's surprisingly consistent.

--
Roland Perry