I've noticed on the catalogue vouchers for champ shows that they usually have printed on them 'to be collected before 12:00'.

What happens if you arrive after this? Do the catalogue sellers pack up after this or is there just a risk that they might re-sell your catalogue?

I've found if I'd arrived after this time, or gone to fetch my cataogue after the time stated, I just need to go to the secretarys office to pick it up, never known them to sell out

They are allowed to resell them and I have been to shows where they have sold out of catalogues.