The Austrian Grand Prix did not go according to plan for the McLaren Formula 1 team, but few races have in 2015.
It introduced a major aero update on Fernando Alonso's car for second practice, but its findings were compromised by minimal running, a crash two corners into the grand prix, and the Spaniard not running in the post-event test until Wednesday.
That means finding out the benefits of the upgrades has been delayed. But what did the changes entail? AUTOSPORT's technical contributor CRAIG SCARBOROUGH explains.