The short development timescale of the battery was achieved by deploying Axeon's accumulated experience in the design and manufacture of lithium-ion battery systems, and by working actively with engineers from both Land Rover and their South African partner Barker Performance Products.

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Meanwhile, Turnbull's training partner Mark Carroll produced a disappointing performance in Sunday's Flora London Marathon.

BBC: Turnbull's fitness battle

She also noticed that the unbeaten boxing champ looked to have smelled his partner's hair during the performance and "looked petrified!"

BBC: Calzaghe trails after dance debut