What determines whether a mistake is fundamental and ownership passes?
<p>This textbook doesn't expound how to determine whether a mistake is fundamental enough. Assume that A and D mightn't have contracted.</p>
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<p>Under section 5(4) <a href="https://www.legislation.gov.uk/ukpga/1968/60/section/5" rel="nofollow noreferrer">of the Theft Act 1968</a>:</p>
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<p>Where a person gets property by another’s mistake, and is under an obligation to make
restoration (in whole or in part) of the property or its proceeds or of the value thereof, then
to the extent of that obligation the property or its proceeds shall be regarded (as against
him) as belonging to the person entitled to restoration, and an intention not to make restoration
shall be regarded accordingly as an intention to deprive that person of the property
or proceeds.</p>
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<p>This subsection deals with the situation where the defendant has received property as a result
of another’s mistake and is under an obligation to restore the proceeds or their value.
A good example of where section 5(4) operates is <em>Attorney-General’s Reference (No. 1 of
1983)</em>,39 where a police officer was overpaid her salary by the police force. She was under an
obligation to return the money (once she was aware of the overpayment) and therefore the
money could be treated as belonging to another (the police force).</p>
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<h2>DEFINITION</h2>
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<p>Where A hands to D property on the basis of a mistake, four situations need to be
distinguished:</p>
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<p>(1) The mistake is so fundamental that ownership does not pass. So although D possesses
the property, in fact it is still owned by A. There is therefore no difficulty
in establishing the ‘property belonging to another’ requirement if D is charged
with theft.</p>
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<p>(2) The mistake is not so fundamental that ownership does not pass and so D owns
the property. But the mistake is sufficient to mean that D is under an obligation
to return the money or its proceeds. This means that, relying on section 5(4),
the property belongs to A for the purposes of the law of theft and so D can be
convicted.</p>
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<p>(3) The mistake is one that means that D holds the property on trust for A. In such
a case A has an equitable interest in the property and the property belongs to
A under section 5(1) of the Theft Act, so D can be convicted of theft (see e.g.
<em>Shadrokh-Cigari</em> [1988] Crim LR 465 (CA); Hallam and Blackburn [1995] Crim
LR 323 (CA)).</p>
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<p>(4) The mistake is not significant enough to give rise either to a claim that ownership
did not pass, or to a claim that there is a legal obligation to make restoration. In that
case the property will belong to D and no theft charge can lie, unless the transfer
from A itself can be regarded as dishonest. In that case, after <em>Hinks</em> [2000] 3 WLR
1590 (HL), a charge of theft could be brought.</p>
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<p>Herring, <em>Criminal Law: Text, Cases, and Materials</em> (2020 9 ed). p 525.</p>

<p><strong>What determines whether a mistake is fundamental and ownership passes?</strong></p>
<p><strong>Short answer</strong>:  When the facts show it is a blatantly obvious error. For example:  I park my car on my neighbour's driveway by mistake (maybe at night in a driving blizzard). Although my neighbour possesses the car as it's on his land, ownership does not pass to him as it's an obvious error on my part. If he treats the car as his own (i.e., <em>dishonestly appropriates</em>) then he may be guilty of theft.</p>
<p><strong>Long answer</strong>:  The word &quot;fundamental&quot; does not appear in the cited legislation, but has been introduced by the courts to mean something akin to being <a href="https://www.lexico.com/synonyms/fundamental" rel="nofollow noreferrer">crucial, pivotal or critical</a> to, for example, a contract - which can be mapped across to the OP's theft scenarios with a similar meaning.</p>
<p>Here are some examples of when a <em>fundamental mistake</em> has, or may be, considered by the courts (with thanks to <a href="https://www.lawteacher.net/lectures/contract-law/vitiating-factors/mistake/" rel="nofollow noreferrer">Law Teacher lectures</a>)</p>
<ul>
<li><p>In <a href="https://www.lawteacher.net/cases/strickland-v-turner.php" rel="nofollow noreferrer">Strickland v Turner (1852) 7 Ex 208</a> Strickland took out an insurance policy on the life of Turner but, unbeknownst to him and the insurance company, Turner was already dead. Strickland sued for the return of his premium payments, and it was held that &quot;<em>a mistake to the subject matter of a contract must be fundamental and persuade each of the parties to enter into that agreement. Since turner was dead at the time the parties made the contract, this agreement was void.</em>&quot;</p>
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<li><p>The perishing of specific goods will amount to a fundamental mistake, as per <a href="https://www.legislation.gov.uk/ukpga/1979/54/section/6?timeline=false" rel="nofollow noreferrer">Section 6 of the Sale of Goods Act 1979</a>.</p>
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<li><p>Goods which have never existed at all will also amount to a fundamental breach, as in <a href="https://www.lawteacher.net/cases/associated-japanese-bank-v-credit-du-nord.php" rel="nofollow noreferrer">Associated Japanese Bank (International) Ltd v Credit du Nord [1989] 1 WLR 255</a></p>
</li>
</ul>

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