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Airhead
@giles337
It would have been cheaper to install a larger single than the two smaller ones.
Top hung Velux would have been a better choice, as you can open the bottom edge outwards for normal use, even if the tunnel is too steep for centre pivot to rotate. They also reverse, centre pivot style for cleaning and have the ventilation flap at the top.
With a bit of care, having the bottom edge open and then unlocking the top, they can be reversed even when the top edge would normally clash with the tunnel.
https://www.roofingsuperstore.co.uk/browse/roof-windows/pitched-roof-windows/velux-roof-windows/top-hung.html