Fitted the wrong colour vinyl in 2 houses once but never heard anything back from the customers. Fitted tiles landscape instead of portrait too a couple of times. Me and a subby cocked up the bond on a marble floor once but had gone too far to change it. It's still there in one of the designer outlets in Heathrow Terminal 2A. Have known floor layers set fire to floors when using contact adhesive when heating the vinyl with a blow lamp!!