I don't understand how paying £10 will keep out unqualified people. If unqualified people want to go to an event such as this, they'll pay the entry fee. As to buggies and babies, it is the organisers that let them in, even though it usually states that children will not be allowed entry. They should be much stricter with this and enforce their own rules.
I don't think charging is the way to carry out this, but there would need to be some way of checking that people are qualified. Are they going to be checking qualifications at the door? If so, this way would cut down the queues to get in. All it would need would be a quick glance at the scan (or photocopy for postal applications) before approval of the ticket. Next year they wouldn't have to check people already "approved", as they would already be in the "approved" group.
I'm honestly not trying to cause an argument here, just taking part in the debate about how to ensure these events are kept professional. :hug: