Question to the Department for Transport:
To ask the Secretary of State for Transport, which organisation or company has been commissioned to conduct further environmental impact studies regarding possible expansions at (a) Heathrow and (b) Gatwick Airport.
WSP Parsons Brinckerhoff have been contracted by the Department for Transport. Their contract is available on https://www.contractsfinder.service.gov.uk/Notice/17ffaddc-3c19-4462-91ae-bf30029c08d9.