Tim Montgomerie is bang with THIS article. He talks about the number of NGOs and lobbyists at the conference and how they tended to hijack fringe meetings. I had my own experience of this at a Conservative Women's Organisation fringe where each of the first three questions came from NGOs. I then banned them from asking any more and got a round of applause for my troubles.
Lobbyists should recognise that party conferences are conferences for the party, and not for them. They may have paid a fortune for their passes, but they are there as observers and not active participants. Party conferences experience little enough conferring as it is, without time being taken up by those with a (paid) axe to grind intervening.
I should make it clear that I am not criticising lobbyists for doing what they do - they often perform a valuable task. But at times, they should recognise that they are best seen and not heard.
Here endeth the lesson. :)