The spot, promoting the company’s “superfast broadband” service, ran earlier this year as part of series of adverts featuring the 100 metre Olympic champion.

In the ad, Bolt says: “Hi I’m Richard Branson and I want everyone to say bye-bye to buffering and hello to superfast broadband.”

BT objected to the spot’s use of the phrase “say bye-bye to buffering”, and whether it implied that Virgin Media customers would not experience any buffering.

In its defence, Virgin Media said that it had taken steps to make sure that the claim in the ad was “not definitive”.

The Advertising Standards Authority (ASA) ruled that the spot must not appear again in its current form, adding: “because we understood that users of the service might still experience buffering, we concluded that the claim was misleading.” The advertising watchdog warned Virgin Media not to “state or imply” that users of broadband service would not experience buffering in future campaigns.

Elsewhere, the regulator banned the broadband provider from running definitive claims on its website about its download speeds. The ASA has banned an ad, which claimed that the service was “up to 7 times faster than the UK average broadband speed.