Does res judicata prevent you from filing separate claims for different causes of action with overlapping facts?
<p>(UK law, small claims.)</p>
<p>This is a follow-on question to one I asked earlier.</p>
<p><a href="https://law.stackexchange.com/questions/60843/splitting-a-claim-into-several-small-claims">Splitting a claim into several small claims</a></p>
<p>A reply to my question stated:</p>
<blockquote>
<p>You can only sue once on the same facts on the same defendant
The issue here is res judicata - once a case between 2 parties has been resolved, that matter can never be litigated again. So Adam cannot split his litigation against Bill.</p>
</blockquote>
<p>I would like clarification of the &quot;same facts&quot;  part.  What if the facts overlap, but have some different elements.</p>
<p>Hypothetical case:</p>
<p>Adam wants to sell a valuable painting.</p>
<p>Bill promises to sell it for £120,000, and charge a fee of  £10,000. But in fact he sells it for £95,000 and charges £20,000 for his work.</p>
<p>So, Adam wants to sue  Bill to recover some of his loss. Deciding that a claim in the high court is too expensive, he wants to make two claims in the small claims court.</p>
<p>First case - a claim under tort law for negligence. Relies on the fact that  the item was sold for less than its proper value.  Cites facts A, B, C, D, E.</p>
<p>Second case - a claim under contract law. Relies on the fact that Bill overcharged for his services.  Cites facts A,B, C, F, G.</p>
<p>Does the different causes of action, and the different but overlapping set of facts allow the splitting of the case?</p>

<h2><em>Res judicata</em> in the broad sense</h2>
<p>The relevant rule is stated in <a href="https://en.wikipedia.org/wiki/Henderson_v_Henderson" rel="nofollow noreferrer"><em>Henderson v Henderson</em></a> (1843) 67 ER 313:</p>
<blockquote>
<p>where a given matter becomes the subject of litigation in, and of adjudication by, a Court of competent jurisdiction, <strong>the Court requires the parties to that litigation to bring forward their whole case</strong>, and will not (except under special circumstances) permit the same parties to open the same subject of litigation in respect of matter which might have been brought forward as part of the subject in contest, but which was not brought forward, only because they have, from negligence, inadvertence, or even accident, omitted part of their case. The plea of res judicata applies, except in special cases, not only to points upon which the Court was actually required by the parties to form an opinion and pronounce a judgment, but to every point which properly belonged to the subject of litigation, and which the parties, exercising reasonable diligence, might have brought forward at the time.</p>
</blockquote>
<p>A more recent statement of the law appears in <em>Virgin Atlantic Airways Ltd v Zodiac Seats UK Ltd</em> [2014] AC 160; <a href="https://www.supremecourt.uk/cases/docs/uksc-2010-0013-judgment.pdf" rel="nofollow noreferrer">[2013] UKSC 46</a>:</p>
<blockquote>
<p>Res judicata is a portmanteau term which is used to describe a number of different legal principles with different juridical origins. As with other such expressions, the label tends to distract attention from the contents of the bottle … Fifth, there is the principle first formulated by Wigram V-C in <em>Henderson v Henderson</em>, which precludes  a  party  from  raising  in  subsequent proceedings matters which were not, but <strong>could and should have been</strong> raised in the earlier ones.</p>
</blockquote>
<p>These principles apply when one claim is decided, and in subsequent proceedings, the plaintiff raises issues which &quot;could and should have been&quot; addressed in the first claim.</p>
<h2>Consolidating pending cases</h2>
<p>Your question raises a slightly different situation, where two overlapping claims are brought at the same time.</p>
<p>Doing this to avoid paying court fees is likely an <a href="https://en.wikipedia.org/wiki/Abuse_of_process" rel="nofollow noreferrer">abuse of process</a>. It would also breach the plaintiff’s <a href="https://www.justice.gov.uk/courts/procedure-rules/civil/rules/part01" rel="nofollow noreferrer">duty to help the court advance the overriding objective</a> of dealing with cases justly and at proportionate cost.</p>
<p>If both cases are pending, the overriding objective can be achieved by consolidating the cases or transferring them to a more appropriate jurisdiction. If the court does this, on its own motion or at the request of the defendant, the overlapping causes of action can be determined in one judgment.</p>

<h2>Same event - one case</h2>
<p>Even when the same facts create different causes of action, they all must be pursued simultaneously or not at all.</p>
<p>The rationale for this is simple: a defendant should only be required to justify their acts or omissions once, not have a plaintiff litigate the same matter over and over.</p>

united-kingdom small-claims-court res-judicata