Thanks for letting us know and I'm glad common sense has prevailed on this occasion. I suggest you try not to get into further such situations rather than planning on being back here though 
For the future, don't forget to bring some means of payment with you when you go out, just in case something odd happens — and I got a little confused at first reading your post as you mentioned you were at Kings Cross rather than St. Pancras, but nothing of course turns on that.
For the future, don't forget to bring some means of payment with you when you go out, just in case something odd happens — and I got a little confused at first reading your post as you mentioned you were at Kings Cross rather than St. Pancras, but nothing of course turns on that.