Wow - can't believe this initial post was over 13 years ago and how chuffed I feel that it's still there and relevant. (I've just sent the link to a couple of people to illustrate how there is no need for an apostrophe!)
Also great to have Di's words on record - really miss being able to have new conversations and cherish the old. And can see how language changes over time as I now always say the PB process rather than the PBs process as PB stands for Protective Behaviours so no need to add an 's', however I still say PBs rather than PB - wondering when that might change?