The mind simply boggles at the questions which are raised:
If the queue is very long will coffee and sandwiches be permitted, and will appropriate sanitary arrangements be available for those whose bladders cannot hold out long enough?
Is one allowed to unzip while still waiting in the queue in order to give Percy a few strokes to raise his head, or will there be standing room on the lorry for 3 or 4 to be doing this while waiting their turns?
Will one be allowed a quick inspection of the profferred orifice, and a quick once-over with a wet wipe where necessary, or does one simply have to dive straight into the puddle?
Will there be a time llimit, or will the "as long as it takes" rule apply?
Will a bucket of water and sponge be available for postwithdrawal ablutions, or must one simply tuck Percy, slime and all, back into the trousering and zip up again (those white stains on the fly are such a giveaway?
Will there be a viewing platform for those who prefer to admire rather than take part?