There was a blonde woman in her 20s with a decent rack called Carla who used to work in Glasgow, circa 2008-2010 (possibly before, not sure). Her younger sister with dark hair and a similar rack was on the game as well (I'm sure I heard they'd been introduced to it by their mum or stepmum or something).
Anyway, those were my early punting days, so I would thoroughly research punts and book them days in advance, and only punt about once every 3 months or so. She'd been on my to-do list for about two years, but I never quite got round to booking her, until one day I decided to go for it. But then I was asked to go to the pub and watch Brazil vs Portugal (World Cup 2010) with my work mates, so I cancelled, thinking I could just book her again another time. Next time I went to book her, she'd disappeared, and I don't think she's ever come back.
So ever since then, I've taken the approach that if I like the look of a WG, I don't prick about waiting for the perfect timing, in case she disappears and never comes back. Which led to my punting increasing massively in 2010 and onwards.