Again this changed for most in 2011. Prior to that we always warned people that there is no record held at the RYA for un numbered certs.I suspect that's the clue. The meaningful qualifications like ICCs or Instructor Quals they have a record of. The Day Skippers/Yachtmasters/Comp Crew etc they don't record. On reflection that seems reasonable. (Although a bit silly commercially - you'd think they'd maintain some kind of pretence to justify the time and money people invest, just to encourage people to buy courses.)
Personally I'm ok with looking after stuff like that. Car keys seem to be a bigger snag.