I have had the ground work done by a well known company in the North West, from Wrexham North Wales. They are going to pattern concrete my drive and path around the house. They have dug up the old path which was two courses below the damproof level, however they have set the new level for the drive and path based on the level of the garage entrance and therefore need to raise the path level to one course below the damproof (this will give a level run from drive to path without the need for any steps). They have left what I think they call a French drain between the house and the new proposed path, it will be 50mm wide and will be filled with loose gravel. The boss of the firm has informed me that it is a recognised method and it will not prevent me selling the house in the future and will prevent any water building up and rising above the dampproof course.
Is he correct and is the work acceptable.