Just before I commit hari-kiri
I found this on the 'Motivated Grammar' blog - and it's about exactly the page that you linked to, Hopey.
"And lastly, what about abbreviations that don?t use periods (TV, CD-ROM, PhD)? Some of the stuff I?ve read demands a -s pluralization (AP Stylebook, College Writer?s Reference), some demands a ?s pluralization (Woe is I), and some says that both are fine (Harbrace College Handbook). You?re free to handle these cases how you want, I think.
So, in summary, pluralize these as follows:
most nouns: no apostrophe
lowercase letters: apostrophe
uppercase letters: either
words as words: either
numerals: either
abbreviations ending in periods: apostrophe
abbreviations without periods: either
Now, if we apply these results to the Apostrophe Protection Society?s page I linked to above about misuse of the apostrophe, it turns out that a few of the complaints are (surprise!) spurious:
Royal College of GP?s
1000?s of roll ends
We pay cash for your TV?s VCR?s Home Hifi
Copy your DVD?s
Don?ts / Do?s
Each of these falls completely within the realm of acceptable apostrophe usage, as defined by the grammar books I am familiar with. Sorry guys! You?ll have to turn your righteous indignation elsewhere!