9.3 km - 59.57 min. Coolish, but deceptively so. Bright sun. 18ºC.
Good luck to everyone who runs in London tomorrow. Special wishes for all those who support dog charitites. The marathon weather forecast says it is going to be very warm, up to 22ºC. So probably not this time to try for for a new record. Just enjoy the day, don't forget to take enough water, especially later in the race. And sunblock may be a good idea.