The advertisements were paid for by the Core Issues Trust, which has been accused of promoting the idea of therapy to change sexual orientation.
Transport for London (TfL) confirmed the adverts were to removed following complaints. They said the adverts did not reflect a “tolerant and inclusive” London.
A spokeswoman added: “The adverts are not currently running on any London buses and they will not do so.”
Since April 1st, 1,000 London buses have been carrying an advertisement campaign from Stonewall that promotes equal marriage with the slogan “Some people are gay. Get over it.”
Stonewall spokesman Andy Wasley said: “It is fantastic news that no adverts will be promoting ‘voodoo, gay-cure therapy’ in London.”
The banned adverts, backed by Anglican Mainstream, read: “Not gay! Post-gay, ex-gay and proud. Get over it!”
The advertisements were said to be booked for two weeks by Core Issues, to be displayed on vehicles running on five routes in central London, including tourist destinations such as St. Paul’s Cathedral, Oxford Street, Trafalgar Square and Piccadilly Circus.
Boris Johnson, the Mayor of London and Conservative candidate for the upcoming elections, said the suggestion that being gay was an illness was “clearly offensive” and added that the he was “not prepared to have that suggestion driven around London on our buses.”
Labour candidate and former mayorsaid: “London is going backwards under a Tory leadership that should have made these advertisements impossible.”
“The adverts are insulting to LGBT Londoners and damaging for everyone who believes London is the greatest city in the world because of its tolerance.”
On its website, Core Issues describes itself as a “non-profit Christian initiative seeking to support men and women with homosexual issues who voluntarily seek change in sexual preference and expression. It respects the rights of individuals who identify as gay who do not seek change.”
Core Issues co-director Mike Davidson said: Our concern is that the debate has been shut down.”
“I think it is very important to raise the fact there are people in this country who want to live beyond gay, they have experienced gayness, and have set themselves other goals.”