On Tue, 25 Sep 2007 00:35:39 +0100, Barry Salter wrote:

The 331 is a pretty good route, but again loses points for being a
single decker.

It's also one of the "Beyond the Fringes" routes that strays outside
Greater London as it passes through Denham.

Denham: Scene of much annoyance as the Post Office/Mini Market will
quite happily sell you a Zones 1 to 6 Travelcard (valid on the 331
throughout the route), but if you want to get the Chiltern Railways
service into Marylebone, rather than the 331 to Uxbridge and then the
Met or Piccadilly, it'll cost you an extra £2.80 for the privilege, as
it's outside the zones.

Mind you, if it was up to me (which it isn't), I'd extend the Z6
boundary to include Denham, just to get rid of that anomaly.

There are plenty of other examples of this, such as the 258 to Watford
Junction and the 81 to Slough (TfL tickets, including any-zone
Travelcards, are valid throughout). Extending Z6 to include them all
would make it rather large!