Of course, with most events not requiring pre-registration, you're always free to dump/gain a crew up till the day of the event, provided that you stick with the decision for the rest of the event.
Paul
Yes, I think you're right here too Paul. As for making Rules at present I don't think we need put anything in writing, lets just keep it an un-written rule as this would appear to be a lot more friendly and if people are prepared to take advantage then I'm sure a few quite words over a beer could resolve the issue.
