The Home Office has responded to claims that preparations for the London Olympics are putting a strain on the country's security services.
"The Security Service prioritises its resources to meet the highest threats day in and day out and has made lengthy and thorough preparations to meet this summer's security challenges.
"The focus of the Government is to deliver a safe and secure Olympic and Paralympic Games that London, the UK and the world can enjoy."
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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.