In message
ilgate.org, Troy
Steadman writes

"Marratxi" wrote in
message

Thanks, Robert, unfortunately no positive identification made despite my
message being on three newsgroups. I can't believe that nobody knows !!
Cheerz,
Baz

Could it be the Fleet River? I cannot find a link for its course at that
point but it is certainly very close and travels N-S.

That's a very good suggestion. "London Under London" records that the
Fleet flows beneath Pancras Way and the sketch map shows it passing to
the west of King's Cross station. Furthermore,

http://www.ctrl.co.uk/flyers/contract.asp?ID=5051

mentions recent CTRL work being carried out in connection with the Fleet
Sewer ... so I think you may well have identified the photo!

--
Paul Terry