tomcs, the spelling of Shaftesbury has been minus its "e" for many years. I sought out the CAA charts section on their stand at Farnborough two shows running, I think 1994 and 1996, to tell them this, and the second time they actually wrote it down.
Over the years I have concluded there must be a reason for the mis-spelling that I don't understand, but in the light of your comment here raising the issue again, I look forward to next year's issue of the half mil....