V50 D5 clicking when ignition on
 

Good evening
I have a problem with my 2006 V50 D5 that I was hoping someone on here might be able to help with.
Basically when the ignition is turned on I get a loud ticking/clicking noise coming from the battery side of the engine. Which gets faster for around 20secs then stops. This is before the car is started. Alongside this I have lost turbo pressure which makes me think it's a vacuum problem?
As you can tell I'm no expert so any advice would be greatly appreciated.
Thanks