Ban on junk food TV adverts begin

The video discusses the impact of high consumption of unhealthy foods on childhood obesity and the regulatory measures taken by Ofcom to restrict advertising of such foods during children's TV programs. Since April 2007, advertisements for foods high in fat, salt, and sugar have been gradually phased out. The age bracket for these restrictions has increased from 4-9 to 4-15 years. Campaign groups argue that Ofcom's measures are insufficient due to concerns over advertising revenue loss. However, a report suggests self-regulation is reducing junk food ads. Ofcom plans to review the new restrictions' effectiveness.

What concerns do campaign groups have regarding the effectiveness of the advertising ban?

What evidence is there to suggest that self-regulation in advertising is having an effect?