Transparency of Lobbying, Non-Party Campaigning and Trade Union Administration Bill

The Leader of the House said that consultant lobbyists will have to register whereas in-house lobbyists will not, and I understand that point. May I return to the point made by the hon. Member for Huddersfield (Mr Sheerman). He asked about large accountancy companies and large firms of solicitors who represent a number of clients and frequently, understandably and rightly come to Members of Parliament and Ministers to put forward their point. Is there not a very fine dividing line between those who will be required to register and those who will not? Is my right hon. Friend happy that the person making the judgment on who should have to register could be very easily compromised?