Stephen Hill and Paul Darling were killed along with charity worker Christina Quinn, said Scuba Travel.

They were on a medium-sized boat that suffered a suspected electrical fault off the Egyptian town of Marsa Alam on Sunday morning.

The Britons were among 15 qualified divers booked for a week's stay.

They had decided to sleep in on the morning of the fire, said a Scuba Travel spokesperson, but the rest of the group managed to escape as they were above deck having a briefing.

A nearby boat evacuated the 12 divers, while the 14 crew had to abandon ship after trying unsuccessfully to reach the three Britons.

Video showed some of those on board jumping into the sea as flames and smoke engulfed the boat.

An electrical short circuit in the engine room started the fire, according to an initial examination by Egyptian authorities.

Ms Quinn, 58, was identified as a victim of the fire on Wednesday.

She worked as chief executive of St Luke's Hospice, Plymouth, and had a long career in the NHS.

"She was a sister, daughter, wife, aunty, friend, and rock to many. She will be missed beyond words," said a family statement.

The chair of St Luke's Trustee said Ms Quinn was "incredibly passionate" about the hospice and had worked there voluntarily for six years.

"We will miss Christina enormously," said a statement.

Details of the ages and professions of the other two Britons killed are yet to emerge.