HC Deb 06 March 1958 vol 583 c153W
111. Mr. Biggs-Davison

asked the Secretary of State for the Home Department what guidance and criteria are given to the Metropolitan Police in determining when a vehicle is, or is not, causing an obstruction.

Mr. R. A. Butler

The question of what constitutes an obstruction is one of law, and falls to be determined by the courts. The Commissioner of Police is responsible for enforcing the law and the instructions he issues, in this as in other operational matters, are confidential.