CCTV investigations in London Road, Kingston found a mound of fat the size of a bus had reduced the 70 x 48cm sewer to just 5% of its normal capacity.
Thames Water has begun repairs to 20 metres of the damaged pipe and work is expected to take up to six weeks to complete.
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Abdul Quddus, 25, an imam at the Baitul Futuh mosque in Morden, visits colleges and universities to try combat messages of extremism.
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Tube and rail passengers planning to travel over Easter could be hit by major engineering projects.