Don't even think about removing the old stuff. You just lay additional layer / Layers on top. Not 100% but I think the minimum specified by the building regs is around 200mm of Fibreglass. just fill the gaps you've mentioned in the old stuff and top off with additional layer. BE VERY CAREFUL NOT TO BLOCK AIR TRANSFER FROM THE VENTS IN THE EAVES, SOFFET BOARDS
laying it in the opposite direction.
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