2016 A5 noise

CantDecide

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New to the forum do please go easy on me.
Had a 2L diesel A6 before, but looking for an affordable A5 3L.
Found one, MOT passed the day before I took out for a test drive.
During the test drive, about 10 mins of 30mph use, I pulled over and lifted the bonnet.
I can hear a ticking noise, others have heard the noise and said it was too quick to be the injectors, but couldn't identify what the issue is. The car has masses of service docs, looks like a service every 7K miles or so.
Any ideas, should I just walk away?
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