www.orange.co.uk/metrofreesim

From Todays London Metro Newspaper: "Metro has teamed up with orange to offer readers a free pay as you go SIM card with 300 free texts. The free text messages will be applied within 14 days of registering the sim.

After that, top up at least £10 a month and you'll get 300 free texts ..."

Just fill out the form and when you get your free SIM, register it by calling 0800 079 0006 (freephone).