Bahrain Testing Day 4: Upgraded Mercedes shows ominous form

It was George Russell in the upgraded Mercedes on top on the first day of the final Bahrain pre-season test as the lap times continued to drop. But what impact could the looming compression ratio saga resolution have on it, and how did the experimental start procedure trialled at the end of the day play out? Edd Straw is joined by Scott Mitchell-Malm to review another gripping day of running, and run the rule over every team on track.

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