Could this be linked?

Salad cream like substance on oil dip stick and on oil filler cap. Havent lost any water or oil yet.

Also the Timing chain is rattling on start up from what I can make out. Due to go into garage next Monday for it to be fixed. Does this sound like two seperate problems, i.e head gasket failure and also the timing chain about to snap or could it be something different. Its all happened at the same time. I have a Vectra 06 plate, 2.2 auto direct.

Any ideas.
Thanks