Thanks to Rusty & Jazzgirl.
I'm not so much ashamed of not getting 28A, as deeply humiliated. Obviously I'd stopped thinking altogether at that point. I haven't indulged in one of these items yet & although there was a free one in my hotel room last weekend I'm not convinced I'm up to the manual dexterity required.
To use the computer I have to come here to the (unheated) study which also prevents me needing a digital detox, more a retox from time to time.
With any luck I should now mange the remaining 4 or so........