Thank you everyone - the contract is for level access with a very slight gradient for water. The Architect we had unfortunately did a late drawing when the BC inspector said we needed air bricks, which we were unaware of and the contractor built it like this without checking with us. It wasn’t until we looked at the bricks under the covers that we saw that air bricks had been put below the damp course. It’s a timber framed bungalow with a brick wall, with a block wall behind, so a bit tricky now to get the telescopic vents in. We met the BC inspector today and he, like several of you are suggesting, the drainage channels with gravel, but I didn’t really want this, but looks like I’ve not got any choice now. So frustrating when this house was meant to be built for my needs and is costing us so much money, yet not how I wanted it. Thanks for all your kind help