The 789bhp Senna is Mclaren's most extreme hypercar yet, a road-legal monster designed for smashing lap times on a track. It even shares a name with one of the company's most succesful racing drivers.
At £750,000, it's the most expensive model in McLaren's range (now that the P1 has been retired, at any rate) - but where does that leave the previous top-end model, the 720S? We're finding out in this four-part series.
In the first episode, we took both cars from 0-100mph and back again to see how the Senna performed in a straight line. Now it's time for a full track battle, as the Senna and 720S each set a lap time at the Anglesey circuit.
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