Tributes have been paid to a 73-year-old British man who died after severe turbulence on a Singapore Airlines flight from Heathrow Airport.

The passenger, named as Geoff Kitchen, suffered a suspected heart attack on the flight, according to a spokesman for Bangkok’s Suvarnabhumi Airport, where the plane was diverted to.

The spokesman added that seven other people were seriously injured, with dozens more suffering minor injuries.

In a Facebook post shared on Tuesday evening, Thornbury Musical Theatre Group in Bristol, England, said: “It is with a heavy heart that we learn of the devastating news of the passing of our esteemed colleague and friend Geoff Kitchen in the recent Singapore Air Incident.

“Geoff was always a gentleman with the utmost honesty and integrity and always did what was right for the group.

“His commitment to TMTG was unquestionable and he has served the group and the local community of Thornbury for over 35 years, holding various offices within the group, including Chairman, Treasurer and most recently Secretary.

“Our thoughts and prayers go out to his wife and the family at this difficult time, and we ask that you respect their privacy.”

A spokesperson for the UK’s Foreign, Commonwealth and Development Office (FCDO) said it was supporting the family of the passenger and was in contact with local authorities.

Singapore Airlines said the flight encountered “sudden extreme turbulence” over Myanmar’s Irrawaddy Basin at 37,000ft about 10 hours after departure, with the pilot declaring a medical emergency and diverting the plane to Bangkok.

One passenger on board Flight SQ321 to Singapore said the plane suffered a “dramatic drop”, meaning people not wearing a seatbelt were “launched immediately into the ceiling”.

Images posted on social media showed damage to the ceiling of the cabin, and food, cutlery and other debris strewn on the floor after the incident.

The 16-year-old Boeing 777 left Heathrow at 10.17pm on Monday and was diverted to Bangkok, landing at 3.45pm local time (9.45am BST) on Tuesday.

There were 211 passengers and 18 crew on board – including 47 passengers from the UK and four Irish nationals.

An FCDO spokesperson said: “We are responding to the emergency landing in Bangkok of a Singapore Airlines flight and are in contact with the local authorities.”

Singapore Airlines said: “Singapore Airlines flight SQ321, operating from London Heathrow to Singapore on May 20, encountered severe turbulence en route.

“We can confirm that there are injuries and one fatality on board.

“Singapore Airlines offers its deepest condolences to the family of the deceased.”

In an update published on social media on Tuesday afternoon, the carrier said: “The nationalities of the passengers are as follows: 56 from Australia, two from Canada, one from Germany, three from India, two from Indonesia, one from Iceland, four from Ireland, one from Israel, 16 from Malaysia, two from Myanmar, 23 from New Zealand, five from the Philippines, 41 from Singapore, one from South Korea, two from Spain, 47 from the United Kingdom, and four from the United States of America.”

Flightradar24 said its tracking data showed the plane encountering turbulence at approximately 8.49am BST while flying over Myanmar.

The flight tracking service said data sent from the aircraft showed a “rapid change in vertical rate, consistent with a sudden turbulence event”, adding that there were “some severe” thunderstorms in the area at the time.

Student Dzafran Azmir (28), who was on the flight, told Reuters: “Suddenly the aircraft starts tilting up and there was shaking so I started bracing for what was happening, and very suddenly there was a very dramatic drop, so everyone seated and not wearing a seatbelt was launched immediately into the ceiling.

“Some people hit their heads on the baggage cabins overhead and dented it, they hit the places where lights and masks are and broke straight through it.”

A passenger from London, who gave his name as Andrew, told BBC Radio 5 Live the seatbelt sign came on, he followed the instruction, and “at that very moment, the plane suddenly dropped”.

He said: “The thing I remember the most is seeing objects and things flying through the air.

“I was covered in coffee. It was incredibly severe turbulence.”

He heard “awful screaming” as the plane was dropping, and what “sounded like a thud”.

Aviation consultant John Strickland told the PA news agency that “turbulence happens” but even with millions of flights each year, incidents are “limited” and “fatalities are rare”.

He said: “Exposure is greater in different parts of the world.

“The South Atlantic, Africa and the Bay of Bengal are all places that spring to mind where there’s a greater incidence.

“There are discussions about whether climate change is influencing an increase in occurrences.”

Mr Strickland said airlines use a variety of methods to minimise the chances of a flight being affected by turbulence, such as weather forecasts, radar and reports from aircraft ahead.

He added: “It can never be taken lightly when airlines recommend you keep the seatbelt loosely fastened throughout the flight.”

A spokesperson for the UK Civil Aviation Authority said: “Our deepest condolences go out to all those who have been affected.

“Accidents of this nature are extremely rare and aviation remains one of the safest forms of travel.”