I just received an email from npower and it offered me a YEAR entertainment pass for free. I couldn't believe it! I clicked the link in the email, entered my npower email address and password and then my npower account (I'm a customer so it's not just for new members) and now have a free year's entertainment!
The code was a one-use type of code so unfortunately can't share it. Hopefully more people will get this email. It was in my spam folder so please look out for it if you're an npower customer.