John, all the best with the Mac (fancy needing a Mac in Arran!)
JimB here's some info for you!
Begging the Question
“…strictly to ‘beg the question’ in controversy is to assume in argument a conclusion which is in fact at issue in the controversy. From this, by a natural development, derives the accepted practice of using ‘to beg the question’ to mean to evade the issue. The current habit of treating to ‘beg the question’ as meaning ‘to raise the question’ is thus inexcusable.”
-Harry Blamires. The Penguin Guide to Plain English. (Penguin 2000) page 93.