Roland Perry wrote:

(snip)

Is this [St. Pancras] the only station with more than one company operating
a ticket office (excluding the Eurostar ticket office for a moment)?


At Euston there's both Virgin Trains and London Midland ticket offices
- the London Midland ticket office is down the slope next to the
gateline to the suburban platforms.

And as has already been pointed out there's both NXEC & FCC at Kings
Cross (unless we're also counting the separate HEx and GatEx at
Paddington and Victoria).

And whilst Victoria's ticket office is run by Southern, it does have
both Southern and Southeastern ticket machines on the concourse - they
are each on their respective side of the station (i.e. Brighton side
and Chatham side). Nor does Southeastern have a ticket office at
Waterloo East either, but again has its own ticket machines there too.

This is all excluding London Underground of course - but at Tottenham
Hale there is a 'one' railway ticket window (branded 'Stansted
Expresss') right next to the LU ticket window, and at Stratford - an
LU station - there is are separate 'one' railway ticket windows too. I
can't immediately think of any other similar examples at shared NR/LU
stations.