“1. In considering the deposit issue the judge relied on one of the few contemporaneous documents. In circumstances in which she found that the witnesses were not wholly reliable she was entitled to come to her conclusion based on that document. There is no real prospect that this court would overturn that finding of fact. 2. In dealing with the question what rent had been paid the judge correctly directed herself on the burden of proof (Judgment § 23). 3. [The judge] then accepted the evidence on behalf of the claimant that the rent had not been paid (Judgment § 24).”