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There is also the Hornby Railways Collectors Association (HRCA) which has been going for years and supports all Meccano Ltd based products including Hornby Dublo, but also Hornby O Gauge Trains, Hornby Acho, Dinky Toys, etc.
Sorry to find out that this thread hasn't been answered in a few years! There are loads of layouts going around the exhibition circuit, I know because mine was one of them! I also have at least one good friend who takes his layout to various locations around North Wales regularly - as I help him...