Nothing on the plane, first time at silver. But I did have the lady at check in make a remark (paraphrased) "Oh I see it's your first flight as silver. I'm meant to tell you how to use our lounges, but this is LCY so...."
First time travelling gold I was greeted by, what seemed like a bouncer that seemed to be herding me toward the club lounge, until I showed my gold bordered phone app at which point he became more welcoming.
It was early, but I didn't think I looked particularly scruffy!