so he'll be able to gain new media coverage over how he received aggressive and threatening letters and emails from 'no' campaigners, whereas his 'yes' campaign -commissioned opinion poll of 2M residents had found a majority in favour of a third runway, as couched in the poll.

The so called poll that found a majority were a favour of a third runway only polled a thousand people. And none were told the construction of a third runway will involved the destruction of 700 homes and the loss of hundreds of acres of open land. As well as increased traffic congestion on roads approaching the airport. They were all polled by telephone and only asked what they thought. They were not told exactly what the implications of Heathrow expansion would be.

"Send hate mail to pro-Heathrow Expansion group" sounds like a deliberate attempt by someone on the side of BAA, probably the police, to incite people to make threats.

I don't see why anyone seriously opposed to Heathrow expansion would want people to send hate mail to these people.