ADAS have just published their 2005-6 Science Review. You will need to request relevant parts, or all, be sent to you. This is simply so that they know where they have gone and can advise of any future updates.
The ADAS website has recently been changed and soon there will be new crops pages. When accessible it can be reached via: www.adas.co.uk/crops - it will contain more information about what ADAS does.