My e-codes aren't working

The first thing we recommend is to double check that you are entering the e-code exactly as it is displayed, we have all confused a 1 with an I before.

Why not try to copy and paste the e-code directly from the email. If doing this make sure that there is no "space" at the start or end of the e-code when you paste it. 
Check to make sure that the e-code expiry date has not passed. E-codes are valid for 3 months from the date of purchase. 
When you attempt to redeem an e-code on a partners site it may "hold" the code for 30mins. If you think you have redeemed a code via a partners website directly you will need to contact them if you haven't received a confirmation from them.