Chandler (Terence Norman) v DPP (No 1)

Factual and Procedural Background

Six Appellants, all associated with Organization A, mounted a campaign of non-violent civil disobedience aimed at preventing nuclear war. They planned a demonstration for 9 December 1961 at The Airfield, a Royal Air Force station situated in The County. Their plan, set out in internal correspondence, was for trained demonstrators to enter the base and obstruct aircraft movements for roughly six hours, thereby “immobilising” the installation.

Because The Airfield is a “prohibited place” under section 3 of the Official Secrets Act 1911, entry for “any purpose prejudicial to the safety or interests of the State” constitutes an offence (section 1). The Appellants were charged with conspiracy both to commit and to incite others to commit that offence. On 20 February 1962 they were convicted and sentenced to imprisonment by Judge Havers.

The Court of Criminal Appeal dismissed their appeals but certified that the proper construction of the phrase “purpose prejudicial to the safety or interests of the State” raised a point of general public importance, granting leave to appeal to the House of Lords. The House (composed of Judge Reid, Judge Radcliffe, Judge Hodson, Judge Devlin and Judge Pearce) delivered its judgment on 12 July 1962.

Legal Issues Presented

1. The meaning of the words “purpose prejudicial to the safety or interests of the State” in section 1 of the Official Secrets Act 1911.
2. Whether evidence as to the perceived benefits of unilateral nuclear disarmament and the Appellants’ beliefs could be admitted to show that their purpose was not prejudicial.
3. Whether the jury, rather than the judge, should determine if the alleged purpose is prejudicial, and whether government defence policy can be challenged in that inquiry.

Arguments of the Parties

Appellants’ Arguments

• Their ultimate objective was to prevent nuclear war; immobilising the base was merely an intermediate step toward a purpose they believed beneficial to the State.
• They should have been permitted to adduce expert and factual evidence (e.g. on the destructive effects of nuclear weapons, risks of accident, radar error, and retaliation) to show that immobilisation would in fact serve the State’s interests.
• The jury, not the judge, must decide what is or is not prejudicial to the State, and therefore the jury required the excluded evidence.

Respondent’s Arguments

• The question of prejudice is to be assessed objectively: interference with an operational military airfield is inherently prejudicial.
• The Appellants’ beliefs or motives are irrelevant because section 1 refers to “any purpose,” and the immediate purpose was to obstruct the airfield.
• Evidence challenging defence policy is non-justiciable; the disposition and armament of the armed forces lie within the exclusive discretion of the Crown.

Table of Precedents Cited

Court's Reasoning and Analysis

The House unanimously dismissed the appeals, though individual judgments used differing emphases. The core analysis proceeded as follows:

1. Construction of “purpose”. The word covers any consequence the actor intends or foresees; a person may have multiple purposes. The Appellants’ direct purpose – immobilising the base – plainly fell within section 1, regardless of their wider political motives.
2. Objective test of prejudice. Whether a purpose is “prejudicial to the safety or interests of the State” is judged objectively. Because an operational military airfield is part of national defence, obstruction necessarily prejudices the State. Personal beliefs cannot convert such prejudice into benefit.
3. Non-justiciability of defence policy. The disposition and armament of the armed forces are matters for the Crown. Courts cannot entertain evidence aimed at proving that the Crown’s defence policy is misguided or that national interests would be better served by unilateral disarmament.
4. Admissibility of evidence. On that footing Judge Havers correctly excluded expert testimony about nuclear strategy, accidental detonation, radar error, and similar topics; they were irrelevant to the statutory question.
5. Role of the jury. Although the jury decides facts, the statutory framework narrowed the factual inquiry to whether the Appellants intended to immobilise the airfield. Once that was established, prejudice followed as a matter of law. The trial judge’s summing-up, though forceful, did not incorrectly remove the issue from the jury.
6. Consistency with precedent. Decisions such as China Navigation and The Zamora confirm that defence matters are outside judicial review; therefore admitting the excluded evidence would have been improper.

Holding and Implications

Holding: APPEALS DISMISSED.

Convictions and sentences for conspiracy to breach section 1 of the Official Secrets Act 1911 were affirmed.

Implications. The decision clarifies that:

• The concept of “purpose prejudicial to the safety or interests of the State” is to be judged objectively; political or moral motives are irrelevant.
• Courts will not entertain evidence attacking government defence policy when determining liability under section 1.
• Interference with a prohibited defence installation is inherently prejudicial, thereby narrowing the factual issues open to a jury.

The ruling strengthens the protective scope of the Official Secrets Act and underscores judicial restraint in matters touching national defence, without setting new precedent on broader constitutional principles.