Bitumen 1F slater's felt, around 12m, recent (Lansdown)

A roll of traditional Chesterfelt 1F slater's felt, bought a few weeks ago because I needed a small amount to line a bat roost in a roof. 1m wide. It was a 15m roll, should be around 12m left. This felt is designed to be used under slates or tiles where there's either no insulation underneath or there's at least an air gap, for example in the tiled roof of an unheated outbuilding. It's not designed to be exposed to the elements like shed felt. Heavy, probably 20kg.