In Valdebebas, north of the capital and just a few steps from Real Madrid's training ground, a vast construction site sprung up in recent months while a hybrid circuit was built from scratch between Barajas airport, the M11 motorway and the IFEMA exhibition centre.
Now the constant rumble of construction machinery has been replaced by a steady stream of vans and golf carts ferrying people to and from the paddock for this weekend's races.
The new…