My geography is pretty rubbish, and I am from 'up the country'
but I wonder whether there may be any shows that are nearer to you?
http://www.towyvale.com/shows08/shows08.html lists all the shows for 2008 if that helps.
Even though I live further up than yourselves, we have always had to travel for at least an hour and a half to visit shows, sometimes up to three. i think it all depends on available venues and hamster club officials knowing their localities better, so they can find suitable places to stage them more easily. They also have to make them accessible for people, so for example, as I am on the East Coast, it is unlikely that a show would succeed in my town, as it would be too difficult to get to for most and not central in the country.
Anyway, hope you are lucky and can find one that is easy for you - good luck