She visited a clinic in north-west London with her father for a two-hour appointment, reports said.

The visit comes as the Metropolitan Police confirmed it would investigate a video obtained by the Sun newspaper that appeared to show her inhaling fumes from a crack pipe, taking other drugs such as ecstasy and cocaine and admitting to downing six Valium.

The disturbing images were said to have been filmed during a party at Winehouse's east London home in the early hours of last Friday, hours before she attended a court hearing for husband Blake Fielder-Civil.

He is awaiting trial on charges of assault and conspiracy to pervert the course of justice.

The 24-year-old's father Mitch told the Sun: "Your video of Amy taking drugs may well be the best thing that has ever happened to her. For all the hurt and pain, it may finally be the thing to focus her mind and convince her to get the help she needs to quit for good."

Winehouse's spokesman told reporters the appointment at the clinic was a regular weekly session which formed part of her continuing treatment for drug addiction.

A Scotland Yard spokesman said: "Officers will be viewing the footage when we receive it from the media. We will then assess the footage to ascertain whether any action needs to be taken. As always we thank the media for their co-operation."

In the Sun's video the singer is seen having a 19-minute drugs binge in which she snorted powdered ecstasy and cocaine before heading to her bedroom, where she inhaled crack cocaine in front of her wedding photo.

Looking dishevelled and wearing a grubby black vest, she was left barely able to talk. When friends ask her to go out with them, she is heard to reply: "I'd be useless to you because I've had about six Valium."