Engine noise on very 1st start up

Noticing a whiny like sound coming from engine when first start up in this cold weather lately but after 10-20 secs it goes away. It sounds similar to this https://www.youtube.com/watch?v=hTwKGp86Frg

Miles are currently on 27222 and its a 61 reg. What i want to know is if its something to worry about and get sorted or not to worry as its just the cold weather. Thanks
 
maybe water or condensation on your aux belt..another thing to check would be the oil dipstick..maybe incorrectly inserted
 
Nothing wrong.

Oil pump on cold start.

Mines done the same and recently had all its belts and pump done.

Nothing wrong here.