A Paris music festival will offer discounts to disappointed Amy Winehouse fans after the troubled British soul singer cancelled a gig at the last minute, organisers said.

The 24-year-old diva with the beehive hairdo was due to appear at the Rock en Seine festival last Friday but pulled out at short notice after falling ill in London, according to her spokesman.

The event's organisers said last week they were planning legal action against her. They said they were notified at 8 p.m., two hours before the concert, and given no explanation.

The festival will offer people who had tickets for Friday an 18 euro discount on tickets for next year's Rock en Seine, organisers said. The price of tickets at this year's event was 45 euros for a day and 75 euros for two days.

Winehouse, who shot to fame with hits "Rehab" and "You Know I'm No Good", had already dropped out of Rock en Seine in 2007.

The festival said on its website her musicians and technicians were already on site at the 17th century Saint-Cloud park near Paris when she cancelled. Her eager fans were given just half an hour's notice that she wouldn't appear.

"Because of the conditions of this cancellation, the festival has taken the decision to start legal proceedings," a message on the festival website said.

The singer is due to appear at the Bestival music event on the Isle of Wight at the weekend. Organiser and radio DJ Rob Da Bank said on the Bestival blog that he had a back-up plan in case Winehouse did not show up.