Funfly - great idea on the little stickers, but I don't agree it should be a subscription service.
For example, Pooleys send out free updates for the duration of the flight guide that you buy - If the CAA are going to change maps annually, which seems to be the case currently, then any mid-point alterations should also be sent out as an update. If the CAA are as keen as they say to help people avoid airspace infringments, etc, then this could only promote saftey.
DW