Fatbergs

The mass of congealed fat, oil and grease is about 100m long and was found in Whitechapel.

It comes after heavy downpour earlier in January, when homes in Great Glen were badly affected.

The removal of the "fatberg" from a sewer in Feltham was "hugely complex", Thames Water says.

Southern Water said a network of sensors spotted the gunk-covered dumbbell beneath the streets.

Thames Water says it took two weeks for it to remove the 120-tonne fatberg from an Oxford sewer.

AI learns the normal behaviour of sewers and can tell if a blockage is forming.

The Talbot's garden was covered in sewage after Thames Water cleared a nearby fatberg.