The reason why theres so few Herp shows in the UK is because of some Animal Welfare Groups like Animal Aid very much oppose to them. Even if a show does get a license granted for one the Anti-Reptile people will go to great lengths to get them shutdown like complaining to councils about the risk of contracting salmonella from reptiles. The only ones which go on now is the IHS Breeder's Meetings which take place about twice each year, but they dont release the details of time, place etc. until the last moment because of the intervention from the anti's.
Ian