A bit late, but just to add to Jo's "You know you're a runner IF" list:
You know you're a runner (in my case) if you can remember your split times, chip time and bib number, but forget your 4-digit bike combination after you've locked the bike to a metal railing in Battersea...despite having remembered the combination at least four times already on that day.
For those of you following the saga (OK, it was only one post) I went down there today, 5 days later, and took a hammer and chisel to it. It broke in about 10 seconds. Then I unlocked my D-lock with the key and was on my way. Hooray!
P.S. Yes, I loved the Dublin medal
P.P.S. Well done, Chas N-B. Pretty much on target, yeah?