Do you have a reference for that? I don't see anything like it at the ICO site.
"In some circumstances those seeking consent might consider implied consent as an option that was perhaps more practical than the explicit opt-in model... For implied consent to work there must be some action taken by the consenting individual from which their consent can be inferred... This might for example be visiting a website, moving from one page to another or clicking on a particular button... The key point, however, is that when taking this action the individual has to have a reasonable understanding that by doing so they are agreeing to cookies being set."
http://www.ico.gov.uk/for_organisations/privacy_and_electron...
http://www.ico.gov.uk/news/blog/2012/updated-ico-advice-guid...
"Implied consent is a valid form of consent and can be used in the context of compliance with the revised rules on cookies."