just found on another forum
"Please note - all competitors must have their own insurance to shoot in the world championships. Please check before you arrive as we will need to see proof of insurance. If you do not have insurance or your cover does not extend to N Ireland Countryside Alliance have agreed to provide cover for £5 for the duration of the event. This can be paid on arrival.
Many thanks
Greg "
so at least we can get insured on arrival if needed.