timing chain

Hi I've been living with this for possibly the past couple of months although I want to get it sorted. I've been told that its the timing chain and eventually after a few thousand miles it will go although i've probably done around 5-6k miles and its been like this and nothings gone (yet) touch...

I have a Vauxhall Corsa D 2014 1 litre around 35,000 miles. Occasionally when starting it will make a loud noise for 2 seconds and the engine will make a sort of jump then go normal, a local garage has said it will be the timing chain than needs replacing but just wanted some other opinions. I...