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It took three weeks to break down and move the 40-tonne fatberg by hand.

Thames Water has found and cleared a 40-tonne fatberg in the sewers near Greenwich.

It took three weeks to break down and move the blockage by hand.

Thames Water claim that fast food restaurants that deal with fatty foods are largely to blame for the build up of the blockage, but state the public also play a part.

Fast food chain McDonald’s say: “We recycle the used cooking oil from our kitchens into biodiesel, which we use to fuel more than half of our delivery trucks. We do it by collecting used cooking oil from our restaurants.”

Converting used cooking oil into biofuels is an expensive and lengthy process and small independent restaurants cannot always afford to use this method.

One of London’s leading eco-friendly restaurants uses a “grease trap”. This contains an enzyme consisting of heavy acidic content, which breaks down grease and fat molecules before it enters the drainage system.

The Food Standards Agency states that all oil waste from catering businesses must be stored by the restaurant and collected by an authorised collector.  Failure to do so can lead to hefty fines and even suspension of a Food Premises Approval licence, which prevents the restaurant from operating.

While restaurants are given strict rules about disposing of waste cooking oil, household waste is not regulated.

The amount of oil and wet wipes that someone decides to put down the drains is down to them.