If my neighbours roof has these do I need them ?

Joined
11 Oct 2016
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United Kingdom
Hi I noticed most of the houses in the row have these on the roof.
I think they are vents ?
Screenshot_20220120-224214_Photos.jpg

I'm wondering if I need them, but as I can see daylight through some areas of the roof it seems like it's well ventilated !
 
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