What Vincent writes is correct. I presumed you did not have a voluntary insurance
Thanks for your replies, both of you. Yes, that's correct. I have only the compulsory insurance. I have been to Cha-Am Land Transport Office and the whole process was easy. I saw the lady at the insurance desk and gave her a copy of last year's compulsory insurance document, simply by way of reference. I also gave her the tabien-rot book. She then sorted out the next year's and handed it over the desk for the cashier to sort out. After twenty minutes or so, the tax sticker was ready and I paid each of them separately.
However - the insurance does not follow-on from the remainder of this year's. This year's ends on 28th but the new policy starts today 10th. The same thing happened last year.
Why is this? It seems somewhat illogical that one cannot renew the tax sticker, without having the tear-off slip at the bottom of the insurance document. But when I renewed the tax last year, the tear-off slip from this year's policy was used then. It's bizarre. But never mind - it's only a week or so lost.
May I ask another question? Is it possible to purchase a better level of cover from the same person (Thai Development Insurance) at that desk in the Land Transport Office?
Essentially, what I'd like is a policy which covers damage to another person's property, either themselves or their vehicle, in the event of an accident.
I do not want a ridiculously expensive policy that covers my own car. Previously I was paying 20,000 THB per year cover. This is more than double the price I was paying in UK for a similar policy.