Brentside was chosen to win a visit from Jamie because of their creative fundraising plans such as a week-long bake sale, a staff vs student basketball match, and a Brent Factor talent show.
During his visit to Brentside, Jamie revealed the school has raised more than £2,100 for Comic Relief, which will be doubled by the UK Government.
Jamie Laing said: “I’ve had an awesome time at Brentside High School today – they wanted to prove to me that charity is ‘Made in Ealing’ and they definitely have.
"The whole school has got involved in Red Nose Day and they should be really proud of how much they've raised – I definitely am.
“My Comic Relief mission has been loads of fun and one of the best things has been meeting kids here at Brentside, and around the UK, who’ve thrown themselves into fundraising for this brilliant cause – I’m quite sad my mission’s over."
Emma Lauder, RS and Psychology teacher at Brentside, said: "We were the one school that was picked out of the whole of the UK. It was really exciting.
"Everyone thought Jamie was really nice and humble.
"He spent a lot of time with the pupils, was happy to take photos with them and was open to questions."
As part of ‘Operation Double Your Money’, the Department for International Development will match up to £10m of the funds raised by UK schoolchildren to help Comic Relief transform the lives of children in some of the poorest parts of sub-Saharan Africa.
International Development Secretary, Justine Greening, said: “It is great to see so many students get involved in Red Nose Day this year. The money raised by schools such as Brentside High will transform the lives of hundreds of thousands of young people around the world who are missing out on the chance to go to school.
“By doubling every penny that British schools raise for Comic Relief, the UK Government will help 300,000 children in sub-Saharan Africa get an education by providing schoolbooks, training teachers, and renovating classrooms to improve access for disabled students.”