Lewis Gayle, a council plumber, has his hands full when the sewage from a tower block erupts from a ground floor toilet, while Tim Stevens has an infestation of rats to deal with.

Strong stomachs are required as the grime-busting team are summoned to the London Borough of Tower Hamlets, when rubbish chutes in a 60s tower block become obstructed.

Incidents in London's East End include the funeral of an elderly lady with no next of kin, and the discovery of a medieval burial site containing the remains of 10,000 people.

The Tower Hamlets Environmental Health Department have a baffling case to cope with - somebody's keeping fighting cocks in a caravan underneath the railway arches.

There's a suspicious death to investigate in the Tower Hamlets mortuary and the team also discover some illegally dumped and rotting meat. Plus wasp nests in unlikely places.

Entertainingly stomach-churning exploits in London's East End. Hot temperatures mean hot heads and high emotions as the environmental officers face a bad cockroach epidemic.

More pleasant discoveries for the environmental health officers. A tenant's dogs are stinking out a council block and a woman is attracting rats by leaving food out for the pigeons.

Bristol's cleaning teams are on high alert as judgement day looms in the Britain's Cleanest City Competition. And a pest officer tackles some particularly persistent cockroaches.