Demand in the rental sector has rocketed as people have been unable to buy their own home, either because they cannot raise the deposit needed or meet lenders' toughened borrowing criteria in the difficult economy, which has pushed up the cost of renting.
The Royal Institution of Chartered Surveyors has warned that it is currently possible for people to set up a lettings agency without appropriate qualifications, knowledge or understanding of the rental process and it is not compulsory for them to conform to codes of conduct.
Several calls have been made for better protections for people living in the private rental sector in recent months, with Shelter reporting in September that almost a quarter of people feel they have been "ripped off" at some point by letting agents' charges.
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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.