Von,

The disclaimer form needs the number on it.

It's for the team managers to ensure that is filled in correctly.

The rules state that riders need a valid license to ride a C90 on the road.

15 teams and up to 7 riders, we'd be checking licenses all day.

I'm guessing that if there was a problem we could confirm his details via another method - but we just wouldn't have time to do this for everybody.