Thanks, macropod. I've run this code and it's almost there. Two slight tweaks - if possible - and I've got exactly what I need:

Additional highlight:
[not preceded by any words][term, ie term at beginning of sentence)][not followed by any capital letter]

Also, is it possible for only the term to be highlighted and not the surrounding text?

Anyway, if those 2 things can be sorted, it would be great. If not, just to say, you've been very helpful, just as you were last time I posted a year or so ago to ask about wildcard searches.