The Archbishop of Canterbury has pledged his support for a mass protest at Heathrow later this month to oppose expansion.

Thousands of people from across London are set to join a carnival through Heathrow airport before gathering on the site of the proposed third runway to form the world’s largest ‘NO' on Saturday, May 31.

The opponents of Heathrow expansion – MPs, local residents and families concerned about climate change – will march from Hatton Cross tube station and through the east of the airport along BAA’s private road before gathering in Sipson, the village set to be flattened if Gordon Brown gives the green light to BAA’s expansion plans.

Celebrities living under the proposed new flightpaths are being asked to attend, while the Archbishop of Canterbury is supporting the event and will be sending a message on the day.

Tamsin Omond, who stood on the roof of Parliament in February in protest at the plans for Heathrow, said: “We’ll spell out the world’s biggest ‘no’ with our bodies. It will be a no to more noise, a no to the destruction of local communities and a no to climate change. We can beat global warming, but not by massively increasing the size of the world’s busiest international airport."