A British Isis fighter who blew himself up as part of a militant onslaught on the Iraqi city of Ramadi has been revealed to be Fatlum Shalaku, a 20-year-old body builder and former student.

ITV News revealed that Shalaku, who had chosen to go by the name of Abu Musa al-Britani, was one of six suicide bombers fighting with Isis as it pushed into the Iraqi city this month. His older brother, Flamur, 23, was reportedly killed while fighting on the frontline in March.

Shalaku is the fifth former pupil from the Holland Park School to have died in jihad, according to The Sunday Times, following the death of his brother and of Mohamed Nasser, 21, who reportedly died during fighting last year. Mohamed el-Araj, 23, from Ladbroke Grove, reportedly died in 2013, and Nassim Terrri, 25, was killed on a mountainside in March 2012.

Fall of Ramadi Show all 17 1 /17 Fall of Ramadi Fall of Ramadi Fall of Ramadi A displaced Iraqi Sunni man pushes an elderly woman in a wheelchair on the outskirts of Baghdad. Reuters Fall of Ramadi Fall of Ramadi An Iraqi family, who fled the city of Ramadi after it was seized by Islamic State (IS) group militants, gathers inside a tent at a camp housing displaced families. AFP Fall of Ramadi Fall of Ramadi Displaced Iraqis from Ramadi. AP Fall of Ramadi Fall of Ramadi Iraqi fighters of the Shiite militia Asaib Ahl al-Haq (The League of the Righteous) stand guard outside their headquarters AFP Fall of Ramadi Fall of Ramadi Iraqis fleeing from their hometown of Ramadi walk on a street near the Bzebiz bridge, 65 kilometers (40 miles) west of Baghdad. AP Fall of Ramadi Fall of Ramadi Iraqi Sunni tribal leaders demand Prime Minister Haider al-Abadi to send forces to protect their city and regain Ramadi shortly after Iraqi security forces withdraw from the city. AFP Fall of Ramadi Fall of Ramadi Displaced Iraqis from Ramadi rest before crossing the Bzebiz bridge after spending the night walking towards Baghdad. AP Fall of Ramadi Fall of Ramadi Ramadi, after fighting on Friday, was one of the army’s few strongholds Reuters Fall of Ramadi Fall of Ramadi Iraqi security forces withdraw from the Anbar state capital, Ramadi, in defeat on Sunday, 17 May (AP) AP Fall of Ramadi Fall of Ramadi Iraqis fleeing from their hometown of Ramadi walk on a street near the Bzebiz bridge, 65 kilometers (40 miles) west of Baghdad AP Fall of Ramadi Fall of Ramadi 130,000 remaining inhabitants of Ramadi, an overwhelmingly Sunni city, have fled the fighting (AP) AP Fall of Ramadi Fall of Ramadi Thousands of civilians fled the Isis advance in Ramadi AP Fall of Ramadi Fall of Ramadi Iraq security forces were seen fleeing from Ramadi, the capital of Iraq's Anbar province AP Fall of Ramadi Fall of Ramadi Civilian belongings can be seen in an abandoned truck during fighting in Ramadi Reuters Fall of Ramadi Fall of Ramadi Isis led its renewed assault on Ramadi with suicide car bombs on Friday Reuters Fall of Ramadi Fall of Ramadi The last remaining Iraqi security forces defending their headquarters against Isis in the eastern part of Ramadi on 14 May Reuters Fall of Ramadi Fall of Ramadi Civilians fled Ramadi as Isis advanced earlier in May. Reuters

A former school friend of Fatlum, who chose to remain anonymous, told ITV news that the student had enjoyed posting photos of his “honed physic” on Facebook and described him as an “extremely friendly, approachable” and “popular” person.

The former school friend said Fatlum’s transition into holding extremist Islamic views was “gradual,” which made the news about his traveling to join Isis more surprising, but his older brother Flamur showed an “almost overnight transformation”.

“[Flamur] was someone you would see drinking, socialising, beardless and popular with ladies – overnight he has a grim expression on his face, his demeanour changes.

“With Fatlum it was more gradual,” they said.

Last year two more former Holland Park School pupils were arrested under terror laws and accused of funding jihadi fighters in Syria.

A British man who called himself Abu Musa al-Britani reportedly blew himself up in a suicide bombing operation for Isis (Isis)

Nawal Msaad (left) and Amal El Wahabi (right) were tried at the Old Bailey this year over charges of funding terrorism (Getty)

Nawal Msaad, 27, who had been caught trying to smuggle €20,000 (£15,800) in her underwear on a flight to Turkey, was cleared of the charge, but Amal El-Wahabi, who had allegedly asked Msaad to be her “trusted courier for the money,” was convicted at the Old Bailey.

Holland Park School was not able to be reached for comment.