A woman who glassed a stranger in the face in a "completely unprovoked attack" at a London nightclub has been jailed.

City worker Lauren Gritz was captured on CCTV shoving Paige Wooding across the dance-floor at Agenda Bar, before snatching the glass from her hand and smashing it into her face.

Gritz, a PA at an international insurance firm, had been drinking for 12 hours to celebrate her upcoming 24th birthday when she attacked recruitment consultant Wooding, 23, the Evening Standard reported.

She was jailed for 12 months and ordered to pay £1,500 compensation, with Recorder Emma Arbuthnot telling Inner London crown court: "This was an entirely unprovoked attack and it could have been much, much worse."

Wooding, who was out celebrating a friend's birthday, had danced backwards into Gritz, who responded by shoving her three times in a "moment of madness" before glassing her in the face.

The court heard how Wooding took three weeks off work and has suffered nightmares, fears of socialising and blackouts since the attack on May 6.

She has also has been left with a scar on her forehead.

"In the first week or so after I was hit I had nightmares and restless sleep," Wooding said in a statement reported by the Mirror.

Briony Molyneux, defending, described Gritz as a "loving family member and friend" and called the attack in the City club a "split-second moment" and the "most terrible judgement call of her life".

Gritz, from Thurrock in Essex, had earlier pleaded guilty to one count of unlawful wounding.

She was fired from her job at insurance firm Jardine Lloyd after three and a half years at the company and had been volunteering at a flower shop while awaiting sentencing.

She wept throughout the proceedings on Friday and bowed her head while the CCTV footage was played to the court.

Detective Constable Joe Farrell, from the City of London Police, said: "There is no excuse for such violent behaviour.

"Gritz left a 23 year-old woman scarred after the altercation. There had been no contact between the two women prior to the incident and the attack seems to be sparked by the victim backing into Gritz while dancing.

"There is no justification for the way Gritz reacted that night."