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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The operation to recover the unexploded bomb near the Houses of Parliament let to disruption in central London overnight.
Southern parts of England and Wales will see sunny skies after a frosty start.
A police spokesman said the incident in the Bourke Street Mall on Friday was not related to terrorism.