Hi MOLITTLE, if you do decide to use Allied don't forget that they will only use their own flooring which is usually more expensive than the DIY chains. In my experience of using Allied in the past their fitting service isn't that great. Could have done it better myself. Maybe I just got bad fitter. Most places give you the price per square metre, so if you want to cover an area of about 30 square metres just multiply the price per square metre by 30 and maybe add a bit for wasteage. Most sell it by the box which is usually over a square metre so if they sell it in metre and a half boxes you would need 20 boxes to cover 30 metres. Then multiply 20 by the box price. The bigger B & Qs often have someone there who will show you how it is fitted and it is not too difficult. If you read the leaflets on Laminate you will see how it is made up and should be able to see the difference in the quality of each type and therefore pick the type that suits you.
Good luck