The guy who does them is very particular. He knows all the minutia of when/where how long how much etc. They did do them for 4 months at the time apparently. He sends you a list of questions, to get exactly what you want and then sends you drafts by email to approve or change. Even down to the stamp of the issuing office. He cant really make any money at it. It must have taken an hour or 2 to go through the process, changes and then post them to me.
you used to be able to do 4/6/12 was handy for splitting up vehicles or skint months! i can remember that and you're well older than me.