Thank you, cduluk and DrDistorzion! I've had a rattle coming from the sliding centre console for ages. I kept moving/removing different things from the storage box as I tried to work out what was moving around in there. I finally removed everything and found it was still rattling. I took the console out and shook it a bit and out dropped a chrome valve cap. I've no idea how that managed to get under there. Worth mentioning that after unclipping the wiring harness you need to pop the cable tie out of the base with a screwdriver. It's a bit like the ones that hold the tail gate trim in place.