“43. The reality is that even if District Judge Banks erred in making a finding contrary to the then claimant’s pleaded case, it has had no effect on the ultimate outcome of this case. If it was not open to the district judge to find, in accordance with the claimant’s pleaded case, that there had been a tenancy created in September 2010, then the only option open to the district judge would have been to find that there had been a statutory continuation of the tenancy pleaded by the defendant in his own defence. That statutory continuation tenancy would have involved the defendant in a continuing liability for rent at the same rate of£500 a month. On the district judge’s findings, that liability continued until the end of July 2021, and then, for a short period of some three weeks, was replaced with a liability for double rent. Had it not, it would have been followed by a liability for mesne profits at the rate of£500 a month. On any view, the appellant would have been liable for rent at the rate claimed by the respondent of£500 a month. 44. There would have been no other finding of fact open to the district judge on the pleadings of both parties. It involves no procedural injustice to the appellant to make a finding of fact consistent with the appellant’s own pleaded case. In those circumstances, I cannot find that the decision of the district judge was wrong, nor that it was unjust because of any serious procedural or other irregularity in the proceedings before him. Had the district judge known the full history of the applications made by the respondent, unsuccessfully, before first a district judge, and then a deputy district judge, for permission to amend its particulars of claim, then he may well have taken the view that it was not open to him to make the finding that he did; but then, inevitably, he would have had to find that the continuation tenancy asserted by the appellant gave rise to the same financial liability…”
“a) The starting point is that a judge is not entitled to decide a case on a basis that has neither been pleaded nor canvassed before him. His function is limited to deciding the issues put before him. b) Where, as in Al-Medenni and Satyam , a ‘theory’ advanced by the judge is outside the scope of the pleaded issues (in the sense of the facts necessary to establish a claim or defence…), that will generally be a clear indication that reliance on that theory is impermissible. c) However, the key point is the interests of justice and, in particular, the question of prejudice to the losing party. d) This may mean that, even if an uncanvassed ‘theory’ is not outside the scope of the pleaded issues, it would be unfair in all the circumstances of the case for the judge to rely on it. Conversely, in some cases it might not be unfair for the judge to depart from the scope of the pleaded issues, although generally only if this was fully addressed at trial.”