Hello, Elle!
Yes, the athletics start on Friday.
BBC appear to be covering it, and EuroSport.
I think Upminster is to the East of London.
An osprey flew over there heading North.
Seems very early to me, though.
I think the Lowes ospreys come via Wales and then North.
Last year Lassie arrived on the 20th March, and Laddie landed on 29th March.
The flight from Africa takes less time than the flight South.
They think that's because of the birds breeding instinct.
Seems plausible?
I'll keep an eye on the "sightings" site to see what's going on.