And here's a technique I've not come across before:

Now let's up the pressure and flood key decision makers with phone calls. It'll only take 3 minutes, but if enough of us call -- they will get the message that we don't want Murdoch to win the BSkyB bid. Here are the numbers to call:

Update: We've made so many calls, we are crashing their phone systems. If you can't get through or if you get a busy signal, it means our pressure is working. Don't give up! Wait a few minutes, and try again.

Here are the numbers to call:

Office of Secretary Hunt: 020 7211 6200
Office of PM Cameron: 020 7270 3000
Office of Deputy PM Clegg: 020 7276 2561
House of Commons switchboard (just ask to speak with your own Member of Parliament): 020 7219 3000