Try this link
http://www.regional-services.com/ur_contact_us.html
BAe still have a 146/rj training facility at Woodford. I have been in touch with them recently. The number for Woodford is not on this link, but a few phone calls will get you to where you want to go.
Flybe at Exeter may still have a few copies and could probably give you the ISBN number. Also KLM UK at Norwich still train the 146 so they should have copies.
Here is the link
http://www.klmukengineering.co.uk/content/Contact.asp
If you have any problems, then PM me and I can dig further.