[K.S.H]

Ok, if you go back tomorrow you should be able to do it for 6 month, they wont give you a disk for the following month when only part way through a month, that way you could put the disk in and get more than 6 month out of it - illegally of coarse, I know in your case the car is already taxed so you wouldn't do it but the post office staff don't know that