Firstly, can I thank each of you for taking the time to reply to my post. I am extremely grateful for all of your help and feel like I have a much better grasp of the pros and cons of tagging now.
Based on the advice above and some reading I did, I have moved away from a notebook/prefix dependent system onto a tag based system and finding it really helpful. I use 'Who, what, when, where, why, how' as the main top level tags and then subdivide under that, for example, 'When' is separated into year, month, date and quarter tags. I also have a few frequently accessed tags that remain outsid