They've just followed up to ask me to couch my request for information
as a Freedom of Information Act request. Heigh Ho! 
--
Walter Briscoe
Interestingly I was thinking about this the other day (having passed
through the interchange at Euston).
I'd actually just emailed the TfL press office to see if they could
get hold of any more details for me (as they're normally pretty
helpful) before i saw this, so if i get any info in response i'll
update.
John Bull