Trust Marks/Quality Marks

Trust Mark Tradesmen! Business examples who use them:

http://www.trustmark.org.uk/

Quality Marks. Example of an organisation using them:

http://www.youthsporttrust.org/how-we-can-help/become-a-member/quality-mark.aspx

CAP (Committee of Advertising Practice)

Research what a trust mark, quality mark and what the CAP do.

http://www.cap.org.uk/Advertising-Codes.aspx

It's a bit random but could possibly come up in the exam. This would count as an external constraint of advertisers.