Mercedes exploited a regulatory nuance during British Grand Prix qualifying by instructing both George Russell and Kimi Antonelli to lift off the throttle metres before the finish line. This counterintuitive maneuver allowed the MGU-K to shut down instantly rather than follow the FIA-mandated 50 kW-per-second power reduction ramp, preserving electrical energy for deployment on the subsequent flying lap's Hangar Straight.

The technique hinges on a rule provision: when a driver fully lifts off the accelerator, the MGU-K may reduce output immediately for safety, bypassing the gradual ramp designed to prevent sudden 500-horsepower losses. Mercedes programmed its electronic control unit to maintain maximum deployment until the precise moment the drivers lifted, making the maneuver legal but highly unconventional. Antonelli described the sensation as unnatural, requiring extensive simulator rehearsal to execute instinctively.

Andrea Stella admitted McLaren was caught off guard when Antonelli debuted the tactic in sprint qualifying. The McLaren team principal questioned whether his squad could replicate it without specific power unit elements from HPP, Mercedes' engine division. Stella confirmed ongoing technical discussions with HPP to extract maximum performance from their shared power unit specification.

Silverstone's short run from Club corner to the timing line makes this exploit particularly potent. While rivals scramble to decode the software logic, Mercedes has turned a safety regulation into a qualifying advantage — one that could spread rapidly if the FIA does not clarify the rule's intent before the next race weekend.