One of England's most prolific graffiti artists has been jailed for two years.
Southwark Crown Court heard that Andrew Gillman and his gang sprayed the words "DPM", "NEAS" and "MOOD" on 120 sites in London, Liverpool and Manchester.
Gillman, 25, from Wandsworth Common, south-west London, admitted conspiracy to commit criminal damage.
Sentencing, Judge Christopher Hardy said: "This was a wholesale self-indulgent campaign to damage property on an industrial scale."
Gillman was the "main mover and organiser" of graffiti gang DPM Crew, which sprayed graffiti on buildings, railway stations and trains between January 2004 and June 2006.
Seven other members of the gang were convicted for the same offence, receiving up to 18 months in prison.
The gang's activities were so extensive that during a three-month police surveillance operation they caused damage totalling £240,000.
"Using these figures, it's easy to see how over a two-year period of operation the bill would run into millions," Judge Hardy said.
The court heard there was evidence their activity also went as far as Amsterdam and the Czech Republic.