Euan Blair found notoriety when his post-GCSE celebrations ended with him being found drunk and incapable in the city's famous tourist spot.
But that incident now seems to be well and truly behind him. Even Mr Blair was reported as saying that he now regards the episode as "hilarious" during a recent visit to Teesside Play and Education Resources Centre in Middlesbrough.
The school's prospectus, however suggests that it would not have found much comedy in the incident. The governing body's discipline statement demands that pupils "behave in an orderly civilised and well-mannered way at all times, both in and out of school".
At the time the Oratory's headteacher, John McIntosh, said he would not e taking any disciplinary action against Euan as his misdemeanour occurred outside of school time.
Euan, 17, is not the only offspring of Labour's glitterati to be elevated to high office within the school. Harry Dromey, son of former minister Harriet Harman and Transport and General Workers' Union official Jack Dromey, steps down this year as head boy.
The decision by the Blairs to send their son to the London Oratory, which was then grant-maintained, was seen as a great betrayal by many in the Labour movement.
The Roman Catholic boys' school was in the vanguard of those escaping local-authority control. Following Labour legislation, the 1,350- pupil secondary is now a foundation school, back within the bosom of Hammersmith and Fulham council.
However it is not all good news for Mr Blair. A mock election at the Oratory was won by the Eurosceptic UK Independence Party.