Instructions:I've recently received an email from Lovefilm asking me to go back (please note the offer is only available for previous users of Lovefilm or Screenselect).
Sign in to Lovefilm.com using the email and password that was registered with them. Once the page opens you should hopefully see a notice welcoming you back to Lovefilm. Read the sentence below this and click where indicated. On the next page copy and paste the promo code. Complete any other info as required. Voila, 3 months for the price of 1.