seeing red tape

I have just received in the post a fine (for parking in a handicapped space) for 135€, thereby discovering that the Astra I had thought sold is still in my name! After driving to the buyer's address, discovering it doesn't exist, and leaving 3 messages all unanswered, I have spent the morning ruminating on catastrophe scenarios where the (uninsured) car is involved in fatal accidents for which I am technically responsible. How have I got into this situation? Plans to get a lungful of mountain air are shelved as I scour the internet and find that I, not the buyer, should have gone to Grenoble Préfecture to transfer ownership after the deal was done. And of course today is Wednesday, the one day they are closed (to deal with post!). So that's tomorrow morning sorted for me.