Downlighters, frightful things. Avoid if poss, if unavoidable, build airtight plasterboard boxes above them, it's a faff.
Otherwise, they're windtunnel outlets in a modern well vented roofspace.
IMPORTANT note to all, replace all halogen downlighter lamps (bulbs) with LEDs today! A sparky friend showed me the evidence of what a halogen downlighter can do in a confined space over time. Think of scorched timber after a bonfire.
Another top tip. Asda LED bulbs came out top in recent tests and they're as cheap as chips right now.