The MPs were due to resume their inquiry into the public industry on Thursday morning, shortly after PRWeek went to press.
In its written evidence to the committee, Spinwatch says that 'lobbying continues to be shrouded in mystery'. It argues that the industry's efforts to regulate itself have 'demonstrably failed to ensure transparency' and advises Parliament to take 'determined action'.
Bell Pottinger Public Affairs chairman Peter Bingle said: 'There is general bemusement throughout the industry at the MPs' latest choice of witnesses.'
Another public affairs agency boss said: 'That whole inquiry is going to end up such a mess.'
The next session is due to take place on 7 February.
www.prweek.com/uk for latest news from this week's session.