You're welcome me old
Following on from a post on ukbouldering, it's worth mentioning that the search box is context sensitive...
i.e. If you want to search the entire forum, then you need to use the search box from the home page.
If you use the search box from within a topic, then only that topic will be searched. If you use it whilst viewing the Caving forum, then only that forum will be searched, etc, etc..