For those who are wanting a higher quality preview of the map, I've setup a Minecraft Dynmap for it over at: http://ordnancesurvey.geit.co.uk/
Also, For anyone actually wanting to give this a go in game without having to download the world file, there's also a public server running it on 5.9.102.172 with the tppos command enabled.
Also, For anyone actually wanting to give this a go in game without having to download the world file, there's also a public server running it on 5.9.102.172 with the tppos command enabled.