Insulating loft Question

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My loft is insulated and boarded out (between the rafters isn't insulated, but I might come back to that one day), but I have question regarding the gable ends of the loft.

The boarding and insulation doesn't quite meet the wall, meaning there is a void that drops to the lower floor, effectively sending cold air downwards. Is this meant to be a gap here for ventilation, or should I seal this with insulation?

See the photos, but I'm not sure how far down that gap goes, but surely it's sending cold air down into the rest of the house, where it inevitably finds its way into the rooms.

For context, this a 200+ yr old house, but given the breeze blocks you can see in the photos there might be a cavity wall here, but not sure if that carries on below the loft.

So, to close the gap or not?

Thanks!
 

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