Thank you oz_mark. After taking the leap to finally make a post on this site, I was starting to feel quite despondent by the responses that were implying I was lying or having a "wind up". Like most of you, I'm a commercial aviation enthusiast with no ulterior motives.
I'm no expert, but my take on the situation was similar to what has now been described in other posts - i.e. that the status credits, whilst not applied until the first day of my new membership year, still counted towards the membership year in which the flights were actually taken. Therefore, as you get to retain any new status for at least 12 months, and my account didn't change to WP until sometime during Day One of my new membership year, I was fortunate to gain the new status for 364.5 days + 12 months. Yes, seemingly lucky. But it's certainly not a "wind up"! Thanks again for your voice of reason