Olympic kayak sprinter Ed McKeever is known as the Usain Bolt of the water.
But today it was all rather more sedate, as he joined volunteers to help clear up the navigation channel of the River Lea in Bow.
It’s all part of the lottery funded Big Waterways Clean Up project - a scheme to help clean up rivers and canals in the five Olympic boroughs.
Since February more than 3,600 volunteers have joined in the project. It's due to end in December and now the hunt is underway to find more funding - to allow it to continue.
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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.