Joseph Day's best friend is overwhelmed with sadness and in "disbelief" after hearing British police found the Kiwi's body after he mysteriously went missing three days ago.

Conor Connolly told the Herald that Day was his best friend and he'd last caught up with him in January for a coffee in Fulham, London.

"Joe was my best friend, we'd been best friends since intermediate school," he said.

"Disbelief and overwhelming sadness is how I'd describe my feelings."

Former TVNZ cameraman Joseph Day's fiancée was terrified that something happened to him. Photo / Instagram

Connolly said local police were continuing to investigate the case and CCTV footage in the area was being reviewed.

A Givealittle page has also been set up to bring Day home to New Zealand to rest.

The page was created by a close friend, Hayley Cashmore.

"The money raised will be used to support Joe and Kelsey's family in their efforts in the open investigation, journey to Bristol, and costs related to bringing him home to rest in Aotearoa, New Zealand."

At the time of publishing, the page had already raised $26,000.

Jaimee Lupton, co-founder of MONDAY Haircare, and Nick Mowbray, Co-Founder ZURU Toy Company, donated $3000.

Avon and Somerset police said a man's body was located and recovered in Avon Gorge, Bristol, late on Tuesday night (NZT).

"While formal identification has not yet taken place, we have updated the family of missing 31-year-old Joseph Day," police said in a statement.

"Our hearts go out to them and we thank them for their patience while inquiries into the circumstances of death continue."

Police asked the public to avoid speculation and respect the privacy of Day's family.

Former colleagues have taken to social media to pay tribute to Day who worked at TVNZ as a cameraman.

"Whether it was the Christchurch terror attack, a trip to Hollywood... or a schoolboy rugby game in Palmy, you always delivered," wrote journalist Jehan Casinader on Twitter.

TVNZ Sunday correspondent Mark Crysell also wrote to Twitter that Day, alongside his dad Pete, was a much loved member of the show's whānau.

"His beautiful eye and deep soul became pictures that lifted our stories to another level," said Crysell.

Andrew Macfarlane, who is based in Australia, said Day would be missed.

"Joe was a brilliantly talented camera operator, and had a real eye for things," wrote Macfarlane on Twitter.

"He had a unique way of getting people to talk with ease in front of the camera, in a situation that can feel absolutely bizarre. A testament to how friendly he was to people ..."

TVNZ's Europe correspondent Daniel Faitaua said he was thinking of Day's family, friends and colleagues "at this very sad time".

British police have confirmed a body has been found in the search for missing Kiwi Joseph Day. Photo / Facebook

Day's fiancee Kelsey Mulcahy earlier told the Herald she was frustrated that police initially deemed Day's disappearance as low risk and would not track his phone.

Day went missing on Saturday night (local time) from the couple's flat in the Bristol suburb of Clifton.

Mulcahy stopped hearing from Day around 9.30pm that night and raised the alarm when she returned home from London the next day to find he wasn't there.

Mulcahy, family and friends took to media and social media to appeal for help finding him.

Earlier, Mulcahy said she faced long interviews with Avon and Somerset police officers and search teams on Monday, and she said search efforts had been slow to kick off.

"The frustrating thing is that his phone is on and they're not tracking it," she said earlier.

"They said they don't have permission because he is not a high risk because I described him as not being suicidal or at risk to anyone else and because he is solidly built, he's a male and he can take care of himself at this stage," said Mulcahy.

"I cannot stress enough how out of character this is for him. We have been together for five years, he wouldn't do this to me, we have a very happy relationship we were both looking forward to going to Bath today. I'm terrified something has happened.