Campaigners furious at Mayor Boris Johnson's plan to ban alcohol on London's trains and buses are to hold a unique alcohol-fuelled party on the last day before the law changes.

Earlier this month the new mayor caused a stir when he announced that from Sunday June 1 it would be illegal to consume or carry alcohol on London's transport network.

In response, campaigners, led by web developer James Darling, 20, from Snaresbrook, are to hold their own party on Circle Line trains on the evening of Saturday May 31 to protest against the changes.

Mr Darling said he wanted the event to be a "civilised" affair, stressing the importance of responsible drinking and gentlemanly behaviour.

He is also encouraging all attendees to don formal dinner wear.

At least 500 people from across London have already pledged to attend, with the numbers steadily rising by the day.

A spokesman for Transport for London said it would monitor the situation.

He added: "We ask that all our passengers act responsibly and considerately towards other passengers when travelling on public transport."

Mr Johnson said the ban was introduced to help reduce incidents of anti-social beahviour on trains and buses.

He added: "I am determined to improve the safety and security of public transport in London and create a better environment for the millions of Londoners who rely on it.

"I firmly believe that if we drive out so called minor crime then we will be able to get a firm grip on more serious crime."

The Last Orders on the Underground' protest starts at Liverpool Street station at 9pm, on the clockwise platform of the Circle Line.