David Cameron is set to attempt to calm Conservative nerves with a major speech on the economy on Thursday.
Downing Street aides said it will aim to drive home the Prime Minister's message on the need to stick to the course on economic policy.
Ministers have been voicing their opposition to any potential cuts to their departmental spending ahead of the Budget later this month.
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Armed police were out in force as runners competed in the largest public event in the city since Monday's terror attack.
Taliesin Myrddin Namkai Meche, 23, was stabbed along with Rick Best, 53, when they tried to stop a racist attack on two Muslim girls.
The shadow home secretary, 63, said she worked in the Home Office for nearly three years when she was a trainee.