The advert, which featured an Apple user being hurled through
the walls of his house by the power of the G5, was initially
approved by the British Advertising Clearance Centre (BACC).
However, the television standards watchdog, the ITC, reviewed the
advert following complaints by viewers.
The ad was misleading, said the ITC, as the claim that the G5
represented "the world's fastest, most powerful personal computer",
was based on limited tests on specially configured computers.
According to a report on the ITC's web site, the complaints, and
Apple's response, were referred to an independent IT expert from
the BACC. The expert found that the claim was not supported by its
independent reviews and that at best, "the G5 was generally as fast
as the best Intel-based workstations currently available".
As a result, the ITC found that there was insufficient evidence
to support Apple's claims. The advert was held to be misleading and
the ITC directed that it should not be shown again in the UK in its
original format.
The ITC's report is available
here