Video: London helicopter crash: Boris Johnson promises review into lighting of tall structures It's a bit too early to draw conclusions from this accident about this or that tall building. What is inevitable is that we'll want to review all our policies, we'll want to look at the way we illuminate tall buildings, the way cranes are illuminated, to make sure nothing went wrong in this case and make sure nothing goes wrong in the future," Mr Johnson said. Mr Johnson added: "There are all sorts of questions that people are asking now about tall buildings, about lighting, about the fog, about the usage of Battersea heliport and those are very understandable questions in these circumstances. People will naturally want to know that we are doing our level best to make sure that London is protected from aviation accidents of this kind. Those are matters that are now being investigated, it would be wrong for me to pre-empt any of that.