He is instead running a low key 800m at Hampstead Heath track in London, the home of British XC, as shown here: [/quote]
This is just another publicity stunt to get fans to come out and support the meet. By "running" the 800m, Webb will be the official starter, he will ring the bell with a lap to go, and then he will handout water to those who actually ran in the race. Afterwards, Webb will be around for some photo ops and autographs for the guys in the race who showed up actually thinking they would be running against the "GREAT AMERICAN," Alan Webb!
It will be a great day for all those running the meet!! Both literally and figuratively!