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The Conservatives underestimated Ed Miliband and David Cameron should have shown more passion earlier on in the campaign, according to Margaret Thatcher's election strategist.
Lord Bell, who helped the former Prime Minister win three successful general election campaigns as communications adviser, also said the party should have deployed Boris Johnson earlier on in the campaign.
"He’s the most popular politician in Britain; I think he’s got the most appeal across the widest spread of voters," he told LBC Radio.
Lord Bell, who earlier this month was forced to apologise for making a tasteless joke live on air about the Germanwings plane crash that killed 150 people, also gave his advice for the last eight days of the campaign, urging the party to "stick to the economy and stick to Conservative values," such as home ownership, jobs, wages and self-esteem.
Mr Cameron delivered one of his most passionate speeches this morning after two Tory donors hit out at his lack of inspiration so far on the campaign trail, but Lord Bell said he should have expressed such enthusiasm much earlier on.
“I think it’s getting near the end; when you get near the end you start trying harder," he said. "I think he’s got a pretty laid back style anyway and I think it’s quite difficult for him to show a great deal of passion; he is now showing a lot of enthusiasm and that’s very good. I would have done it a bit earlier.”
In pictures: Experts' predictions for the General Election - 26/04/15
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