Dear Wallpaper
You will probably find it useful to look at
http://www.cipd.co.uk/
it is the website of the Chartered Institute of Personnel Development and there is a great deal of information on there including the results of surveys which they have carried out. You may receive more information by sending questionairres to the human resourses departments of companies together with a covering letter explaining what you are doing than posting on a site such as this.
Liz