I will need advise on how to move the Koi though
Kim,
Moving koi is easy in principle. If the journey is short, you can transport them in a (double) bag with more air than water, put the bags in cardboard boxes and drive as quickly as is safe and legal. For a longer journey, it will be best to inflate the bag with oxygen.
That's the principle but obviously there are the details of how to put that into practise, such as how to net a fish, get it into a bag without damaging its scales or splitting fins, inflating the bag, sealing it, placing it in a car and what to do when you arrive. What would you would like described in detail? (All of it?).
Alternatively, you can move koi in a transport tank. This would be expensive for a one-off use but, if you choose this method, the tank should be filled almost to the brim before the lid is zipped up to prevent the water from "sloshing around" with the risk that the fish will be thrown around inside and possibly harmed. This means that you will need an air pump to continuously aerate the water during the journey because there will be very little air-space above the water.
Moving koi is safe if it's done right or dangerous if it isn't. As it's koi show time, you could go to a show, stay until debenching time and watch how it's done by the different exhibitors. The general principles are the same but there are slightly different techniques, the most skilled of which is how to get that elastic band to seal the bag without breaking or pinging off somewhere!!! In the meantime, what is it that you want to know?