Ealing supermarkets will be called to task for failing to stop vandals who take shopping trolleys and dump them in rivers.
British Waterways has launched a telephone campaign with floating platfom piled high with some of the rusting heaps that pollute our canals.
The boat passed through Northolt and Southall along the Grand Union Canal on Tuesday morning.
More than 3,000 dumped trolleys are recovered each year and would reach more than10 times the height of Canary Wharf.
Waterways is urging people to use the new hotline to report sightings with the supermarket which owns the most will receive the "Off Our Trolley Award."
The most reponsible supermarket chain wiill get the "Golden Trolley Award."
If you see discarded trolley contact 01923 201120