But they said further amendments were needed. In a statement the advertising bodies said: "The amendments to the Bill are limited and the Act will still mean that only official sponsors will be able to associate themselves with the London 2012 Games. Any form of association with the Games by unofficial sponsors will be an infringement of the new association right."
The IPA has been lobbying for changes to the bill to ensure a balance between protecting official sponsors and "allowing genuine freedom of commercial expression, especially that of local businesses."
The Lords on Tuesday agreed to three changes to the Olympics and Paralympics Bill. The first concerns the use of words or expressions associated with the Olympics in advertising.
A list has been drawn up of protected words, such as "Games", which advertisers are asked to avoid using. The Lords have agreed that there will be no automatic presumption that the law has been broken should ads carry these words, and that it will be left to the courts to decide whether there has been an infringement.
A second amendment places a duty on the Government to consult with the industry before introducing restrictions on the location of advertising around Olympic venues; and finally the Government would also be bound to consult on any changes to the list of protected words.