Like any listing sites - it relies on people keeping the info uptodate.

THEY DON'T.

I pro-actively try to update my info. Even with e-mails and personal contact at Festivals it is a logistic nightmare.

When new - they all over you to list. When going well they can't understand why you want to know if it is still current. When it has to fold they have no motivation to tell anyone anything.

But then some people understand. And they are rewarded with a better listing.

see cresby.com and I have been including full post codes for nearly 10 years with links to multimap.