Castle v Crown Prosecution Service [2014] EWHC 587 (Admin)
Facts
Mr Castle was convicted after riding his motorcycle at 59 miles per hour on a section of the M62 subject to a 50-mile-per-hour limit. He did not dispute the relevant journey or speed but challenged the legal enforceability of the restriction. His arguments concerned the statutory power to impose variable speed limits and the involvement of a Highways Agency official in making or implementing the order. The appeal required examination of the Road Traffic Regulation Act 1984, the relevant order and the application of Carltona within an executive agency.
Legal Issue
Whether the road-traffic legislation authorised the variable speed restriction and permitted the relevant departmental official to act for the Secretary of State under the Carltona principle.
Held
The High Court dismissed the appeal and upheld the enforceability of the restriction. It rejected the challenges to the statutory basis of the variable speed limit and to the exercise of the ministerial function through the Highways Agency. Pitchford LJ treated the agency as part of the machinery for which the Secretary of State was responsible to Parliament. Carltona applied to suitably qualified officials making the traffic-management decisions required by the statutory scheme. The minister was not required personally to attend to every motorway restriction. That conclusion depended on the relevant powers and administrative structure; it was not a general licence for any body to exercise any ministerial function.
⭐ Legal Principle
The Carltona principle can permit a responsible departmental official to act for the Secretary of State when exercising a statutory function. Castle applied that approach in the road-traffic context, subject to the governing legislation rather than an unrestricted power to delegate.
Significance
Castle applies Carltona to the operation of government through an executive agency. The substance of the administrative relationship mattered more than the fact that the official worked in a separately named organisation. It also illustrates a collateral challenge to subordinate rules in proceedings for a substantive offence. An exam answer should establish the relevant statutory authority before considering whether the official could exercise it. Agency status alone neither invalidates nor automatically validates every decision attributed to a minister.
Common exam questions about this case
Why could a Highways Agency official act for the Secretary of State?
The court treated the agency as part of the administrative machinery for which the Secretary of State remained accountable. Carltona could therefore apply to appropriately qualified officials making traffic-management decisions. The agency’s name did not itself make the decision an unlawful external delegation of ministerial power.
Did the conviction depend solely on proving the recorded speed?
No. Castle also challenged the legal validity of the speed restriction. If the relevant order or its implementation lacked statutory authority, that could affect enforceability. The court rejected the legal objections and dismissed the appeal, rather than treating the existence of a recorded excess speed as the whole analysis.
Does the case authorise ministers to transfer every power to an agency?
No. Carltona depends on the statutory construction and the relationship between the official and the minister’s governmental functions. The case concerned traffic-management decisions within a particular framework. A different statute may require personal action or impose conditions that an agency official cannot satisfy by relying on this case alone.