They are not requiring the CD-Rom like Bryce does. Email, faxes and telephone calls can get from the UK to the far side of the USA fairly quickly, though you are correct that turn-around time due to time-zone differeneces may cause some delays. However, due to the fact that there is a 7-day grace period that you can use Poser 5 or whatever fine without requiring the unlock code, that should be plenty of time for them to receive your message and get the response back to you.