As Red Bull searches for answers over their drop in performance, Max Verstappen took part in a secret test at Imola in a two-year-old Red Bull RB18. The test was part of ongoing work by the team to improve the RB20’s resistance to riding bumps and kerbs at recent races including the Emilia Romagna and Monaco Grands Prix. Verstappen noted how this was a long-standing weakness that left the team ‘exposed’ after Monaco, while McLaren has emerged as one of the quickest packages after Lando Norris nearly won the Spanish GP. The team did not go out of its way to publicise the running, but it did giv…