Something loose behind dashboard on passenger side

I own a 2009 Land Rover Defender 110 which I imported from the UK to Kinshasa, DRC. It has been trouble free despite our terrible roads. I have developed an annoying rattle behind the dashboard on the passenger side and know that I probably need to some how get back there to see what has come loose and needs to be tightened. Any suggestions on what it might be?

LHS of dash could be:
1. Wiper motor or related components.
2. Windscreen demist / vent nozzle
3. Left speaker
4. Something else that has worked its way along