CLs or 5 van sites?

Many years ago, we knew CLs as "5 van sites". For a few years we moved our membership to a rival club (no names, but you know who I mean). When we saw sense, and returned to the Caravan Club, we couldn't understand what CLs were. It took us some time to realise that these were the 5 van sites. Doe anyone remember when the name was changed?