Apoligies if you already know this, but here's a quick test for the VVT.
FWIW my previous S40 1.8 had this issue, the on & off, rising & falling ticking, for all the time we owned it, but it never bothered me.
Some people would suggest / recommend replacement, but it's not an absolute requirement.
https://www.volvoforums.org.uk/showthread.php?t=206987
If you did the test & commented on here it might alleviate a prospective buyers concerns as to what's causing the sound.
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Now: 04 reg V70 2.4 SE 2.4 auto 177k
Then: Volvo, Saab, BMW, MB, Ford, Vx, Opel, Fiat, Rover, Porsche, Alfa, Austin, Renault, etc
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