On Tue, 26 Jul 2005 21:09:13 +0000 (UTC), David wrote:

On all printed publicity for underground and buses, the phrase 'Mayor
of London' is shown. Why is the ON at the end on LONDON always in red
whilst the rest of the text is in blue?

Perhaps it's an attempt to emphasise to Francophone visitors that the
place isn't really called "Londres".

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http://gallery120232.fotopic.net/p9925977.html
(319 381 descending the 1 in 27 leaving London Blackfriars in 2004)