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27 January 2014, 13:53 | Updated: 27 January 2014, 14:08
A Christian charity has won an important ruling in its battle over a ban on a London bus advert suggesting gays can be helped to "move out of homosexuality".
The Core Issues Trust charity accused Boris Johnson of unlawfully using his position as chairman of Transport for London to ban the advert.
The High Court previously rejected the allegations, but today the Court of Appeal has said there must be a further investigation.
The ad displayed the words: "Not Gay! Ex-Gay, Post-Gay and Proud. Get over it!"
The Mayor of London said the advert was "offensive to gays" and could lead to retaliation against the wider Christian community, but the charity suggests Mr Johnson banned the advert in order to secure the gay vote and boost his re-election campaign in 2012.
Master of the Rolls Lord Dyson says a further investigation will aim to find out whether the removal of the ad was ordered by the Mayor, and whether he had acted "for an improper purpose".