I always tip my hairdresser and her junior, but at the clinic where I get Botox and fillers, I just pay at the reception desk and leave. It's just occurred to me that maybe I should be tipping the woman who does the treatments? She accompanies me to the desk, but I thought that was maybe standard procedure in case I did a runner without paying, then I thought - what if she stands there as clients tip her? Mortified if it's usual practice and I've just been ignoring it.