A 13-year old from Enfield is set to become the youngest girl ever to kayak across the Channel today.
Maia Wallace-Loizou, together with 15-year old Dylan Barber-May from Hackney, hope to paddle the 20 mile crossing in under 4 hours.
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John, who began running for Age UK back in the 1980s when he was aged 53, has raised an incredible amount since then - more than £40,000.
It was Tom's second marathon in two weeks run in memory of his father, Martin Campbell.