We have to request a self cert or medical sign off for everyone on Seasearch dives as part of our insurance. Just had someone who's never heard of them, despite being a regular UK diver. He says he's part of a club, but didn't bother with the BSAC bit. Don't people get asked for them before going on boat dives? Genuine question, I tend to stay within my own bubble and don't go on 'normal' trips much.