The father of a British woman missing in New Zealand has flown across the world to make an emotional appeal for help finding the young backpacker.

David Millane said his family was “extremely concerned” for the welfare of his “fun-loving” daughter Grace Millane, who has not been seen or heard from since Saturday.

The tourist, from Essex, had been “bombarding” her loved ones with messages and pictures throughout her year-long round-the-world trip.

But her family became concerned when contact with Ms Millane, who turned 22 on Sunday, went cold.

She was last seen at the Citylife Hotel in Auckland at 9.41pm on 1 December with a “male companion”.

Grace Millane had been in regular contact with her family during the trip until she went missing from her hostel (Michael Millane)

During an emotional press conference in Auckland on Friday, Mr Millane said: “Grace has been missing for seven days.

“We last had contact with her on Saturday, 1 December, and as a family we have been extremely concerned for her welfare.

“Grace is a lovely, outgoing, fun-loving, family-orientated daughter.

“Grace has never been out of contact for this amount of time.

“She’s usually in daily contact with either her mother, myself, her two brothers or members of the family on social media.”

Detective Inspector Scott Beard, of Auckland City Police, said officers had identified and spoken to the “male companion” last seen with Ms Millane.

DI Beard said officers had also identified an apartment at the city centre hotel as a location of interest.

“It has now been six days since Grace was last seen,” he added. “At this point, we hold grave fears for her safety.”

He added that they “still have no evidence of foul play”.

David Millane, father of missing British backpacker Grace Millane, 22, speaks at a press conference in Auckland, New Zealand, Friday, 7 December 2018. (AP)

Mr Millane arrived in New Zealand on Friday morning and told reporters it was unusual for his daughter to be out of contact.

He said: “She has been bombarding us with numerous photographs and messages of her adventures.

“We are all extremely upset and it’s very difficult at this time to fully describe the range of emotions we are going through.

“Finally, I would like to take this opportunity to appeal to anybody who has seen, spoken to, or come into contact with Grace over the last few days and come forward with any detail, no matter how small.”

Ms Millane arrived in New Zealand on 20 November, having previously visited Peru.

Her last Twitter post appears to have been made on 30 November, the day before she was last seen.

Police said more than 25 staff were working on the case and were trawling through hours of CCTV footage to trace her movements.

A spokesman for the Foreign Office said: “We are providing consular support to the family in the UK, and working with the New Zealand Police in relation to reports of a missing British national in New Zealand.”