I had a thought, why couldn’t there be a “couriered in class” ie from places north of Watford, to allow people to send their jars in, and get them returned. We all get deliveries these days, so surely it’s something that could happen.
II know it might cause a few issues with having to change the standards a little regarding scratched or dented lids, but then at least it might then be actually be considered to be a “National” show, rather than one that is largely attended by beekeepers with time (and money) on their hands or from London and Home Counties.