H Mattrom,
Yeah, you're probably right, I think I just got so irked by 8d I thought 'well, if he can do it, so can I', when I should have just let it go.
By the way, after confirming that 8d wasn't in either Chambers or the OED I decided to look further afield, no stone unturned and all that, and so checked Collins and, wouldn't you know, it's in there as 'British English - myopia'!
I don't know why these things bother me so much - maybe I need to get out more 😜