A graffiti vandal is at the centre of a police hunt in London after causing more than £1m worth of damage by spray-painting a tag across buildings and the Tube network.

The vandal’s tag, ‘Zerx’ has also been sprayed on houses and schools in boroughs across the capital, including Harrow, Brent and Westminster.

In January, a 21-year-old man was arrested and bailed in relation to the graffiti vandalism of the Admiralty building in Whitehall during student protests last December.

Det Insp Paul Armstrong, of Metropolitan Police, said: "Using this type of graffiti not only looks very unsightly but can also cost councils, London Underground and members of the public a considerable amount of money to remove."

"This tag has been scrawled across residential homes as well as schools, sheltered accommodation and historical structures."

Anyone with information has been urged to contact police.