Membership areas
Most areas of the country have a local IVC. Some cover just one large town (like Swindon IVC), and some cover one or more counties (like Herts and Beds IVC).
All IVC Clubs subscribe to the Association of IVCs (AIVC) reciprocal membership agreement. This allows for members of any IVC to attend the events put on by other IVCs.
For people living near the borders of two IVCs, dual membership can be a good idea, as it ensures they get both bulletins. For example, members living near the Herts/Essex border may find it worthwhile to be members of both Herts, Beds & Bucks IVC and Essex IVC.
If you live in one IVC's area but work in another, you would be welcome to join both Clubs.