Soldiers wounded in the war in Afghanistan have completed their five day swim around Shepperton Lake in Surrey this morning.
They have covered 250 miles to raise money for those injured in battle, with the funds going to the Household Cavalry Operational Casualties Fund.
They were greeted with champagne after they broke the open swimming world record on Thursday.
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The ComRes survey for ITV News and LBC showed the Labour candidate increasing his overall lead over Conservative rival Zac Goldsmith.
The latest poll for ITV London and LBC shows Sadiq Khan leads Zac Goldsmith by 45% to 36% on first preference votes.
Corbyn was unveiling a poster less than a mile away as Khan gave his final campaign speech to party supporters in London.