Most of the retailers have got wise to that. They will do you the plan and let you view it , but will resist giving you a copy for obvious reasons. ie It empowers you to shop around. If you are not doing anything radical or changing the layout, why not measure each unit that is in there at the moment. They will be either 1000mm,800mm,600mm,500mm,400mm and occasionally 300mm. Do this for wall and base units. Measure up the worktop lengths, make a note of sink and tap requirements. Measure up how much plinth ( the kickboard piece between the base units and the floor), and how much cornice and pelmet if any you want for the wall units. You may also need to bear in mind that the ends of the base and wall units may need colour co-ordinating end panels to match the frontals. With that info you can get a supply only quote. Don't let you first port of call retain your list. Alternately if yiu are using a kitchen fitter get him to take all this on board. If he has an account with Howdens they will do the whole survey and give him any plans or drawings. Bear in mind appliances and tiling or flooring requirements.