As far as I know all riders that were having problems earlier have now registered. One area that is still struggling to hold up is those paying with PayPal. Unfortunately this is out of our control, paypal is a great service its just not a strong system. In the early hours the server was trying to survive the equivalent of a hacker attack.
If you still haven't registered and don't have a credit card and have no option but to register with paypal and it fails please contact me and I will arrange registration for you. My details are on the Newton's contact page