A PC World ad campaign that featured FM transmitters for iPods has been banned by the advertising regulator.

The national press adds promoted one such device, and warned potential customers that use of the device remains illegal under antiquated UK laws.

The Advertising Standards Authority banned the campaign because seven complaints were received that said the ad encouraged people to break the law.

PC World argued that it wasn't being irresponsible as Ofcom is expected to make such devices legal by Christmas.