Irby replied: 'I don't know what this lewd behaviour is.'

On hearing details of what she had been accused of she said she was 'shocked' adding: 'It sounds like I'm hearing about a stranger.'

When Sexton asked her if the overall account was true, she replied: 'There's some stuff there I really can't remember, and there's stuff there (that sounds like) I didn't behave like a young lady.'

Irby told the court she had never stripped off. Instead she had changed into trousers by pulling them up under her skirt - 'a trick we have all learned of in childhood'.

Passenger Polly O'Callaghan told the court that Melia's girlfriend, model Sarah Hannon, had a row with him over his behaviour.

O'Callaghan said once Hannon moved away, Irby and Melia 'became quite flirtatious', adding: 'He was touching her face over the seats.'

'She did say 'I'm not normally this relaxed, it's all the opium I've been taking',' O'Callaghan said, but added Irby may have been joking.

Irby was accompanied by her two-year-old son on the flight. 'She asked the air hostess for a nappy bag. The air hostess went to get the nappy bag and she threw the dirty nappy on the seat behind her,' said O'Callaghan.

'I think she did it because she thought the air hostess had not come quick enough. She asked for a wet wipe at one point, She said, 'Get this s*** off my hand'.'

O'Callaghan also heard Irby 'very loudly' call an air hostess 'a bitch'.