LyX citation styles after insertion

Got it - I opened the .lyx file in a text editor (TextMate, but any would do) and did a find and replace to change the citation style of every citation.

• Find: LatexCommand cite
• Replace: LatexCommand citep

That extra p makes all of the difference! Probably worth a second find and replace to make sure there are no instances of citepp, and definitely worth doing a backup first.