Plum 40 mm slate is exactly as described. Good quality and very regular sizing. Just one shovel-full of dust and small bits at the bottom of the bulk bag. So no complaints re wastage.
Delivery arrived within specified time frame, however, the bulk bags were delivered on flimsy pallets which broke when taken off the tail lift. This made it difficult to get the pallets onto my driveway over the dropped kerb. Courier's problem I believe. Excellent service from the driver though and job soon accomplished. Bulk bags are moved using a pallet truck, so there is minimum clearance for the wheels to negotiate a steep dropped kerb or incline. In all, a great job and would definitely use again.