In most cases, all large goods produced by the same company/ brand will arrive as one delivery and goods from different companies will arrive separately. Sometimes if you order a full pack and a split pack, these may arrive separately as the split pack will take longer to prepare. The delivery will usually be booked with you directly by the delivery company once your goods arrive at the depot closest to you. 

Small items such as sealants, paints and mortar products will always be sent out separately on a smaller courier service and are unlikley to be prebooked.