What does Cameron mean by "Michael Osadchey has helped me a

It was early morning in London _____ Prime Minister Cameron arrived to give his speech. A．where B．when C．while D．that

And in a departure from his predecessors,Cameron rarely in-vokes the name of the Conservahve's biggest icon:Margaret Thatcher."To me,Mrs.Thatcher-it's all along time in the past," says Cameron."People are voting at the next election who were born after Mrs.Thatcher left office."
1.in a departure from his predecessors这里面的in是什么意思啊?
2.it's all along time in the past这是个什么结构啊?该怎么翻译?
3.People are voting at the next election who were born after Mrs.Thatcher left office."voting at是固定搭配吗?who定语从句修饰people还是election,像是修饰people,但为啥该放后面了?

英语翻译
完整的场景：
Cameron:Hi.I'm Dr.Davis.Gabi?I have got to learn to look at my names
first a little more often.
Gabi:Hey,Cameron.This is a waste of time.
Nick:We haven't met.I-I'm Nick Fallon.
Cameron:Ah,got it.Right.So you fainted?
Gabi:I got dizzy.
Nick:She fainted.
Gabi:For,like,a nanosecond.

英语翻译
一个书目 翻译完了 立刻 50分送上
References
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It was early morning in London _____ Prime Minister Cameron arrived to give his speech. A．where B．when C．before D．that