Fill in your info form online at http://www.bikebiz.co.uk/b3/updateb3/
In the 2003 edition of the Bible, there will be pictogram notification of who has and who hasn't returned their forms. This is to make it easier to work out which companies are actively trading, and hence likely to be proactive.
The cover ads may have been snapped up already, but there are still premium positions in the book itself. Or book a display ad near to your entry.
Incidentally, here's some clever thinking from Furnitubes International Ltd, the manufacturer of cycle parking facilities. They've listed their email as firstname.lastname@example.org in order to track responses from the book and the online B3.