I do not recommend AO's installation service for integrated dishwashers. We paid £90. They installed the dishwasher crookedly in the space and then put the door on so crookedly that there was no gap bottom left but a 6mm gap top right, so the door would catch every time it opened or closed, and escaping steam would have warped the door and frame finish. Although they sent another pair of 'fitters' to put it right, they spent most of the time saying they couldn't and when they left, it was no different - they seemed clueless and unprofessional. We had it put right ourselves and discovered they had installed the dishwasher at the wrong angle and had removed brackets that were supposed to support the door as well as using screws that were half the depth they should have been. No wonder it was crooked. Do not pay them for installation. Either do it yourself or pay professionals.