Question to the Cabinet Office:

To ask the Chancellor of the Duchy of Lancaster and Minister for the Cabinet Office, what estimate he has made of the cost of installing air filtration systems in Number 10 and Number 11 Downing Street since March 2020.

The Cabinet Office, which includes the buildings in Downing Street, follows the appropriate Working Safely During Coronavirus guidance. This includes consideration of ventilation as part of any risk assessment. The HSE also provides guidance on this issue.

Air filtration units are one option (not a requirement) that may be used as a mitigation where it is not possible to improve poorly ventilated areas.

In that light, the Cabinet Office has not deemed it necessary, at this time, to install such systems. We will keep this matter under review.