New robotic technology which can carry out repairs to leaking gas pipes from the inside is being tested in London. If successful, it means repair work can be carried out without the need for disruptive roadworks.
See the robot in action below.
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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.