I used the instructions on the website to get a number to come up on the radio screen, which their website indicates is how to get the serial number. I then entered this and paid my £9.99 to get the code. I then received an email asking me for the serial number on the box/manual/side of the radio because the number they accepted when they took my payment isn't the correct number (why let me pay for it then?!?!?!). If I had this information I wouldn't have needed their instructions or be paying for a code. They then said that they couldn't give me a code without it and refunded me £7.99 - Deducting £2 for the cost of sending me an email telling me they've charged me for something they can't do. Their 100% money back guarantee is a complete lie. AVOID. AVOID. AVOID.