I've just received my tax disc (vehicle license, for those unaccustomed to the terminology).
I paid for it online, which is good. As I did earlier in the year for my TV license.
However, both the tax disc and the TV license have one flaw. They send you the reminder letter about a month before it's due, but you can only pay from the 15th, so you get the reminder about 2 weeks before you can take action on it. Which means that there's a real danger of filing the reminder away meaning to act on it and then completely forgetting about it.