“In my judgment, the requirements of substantiality or (if different) genuineness would not be met simply by showing that the dispute is arguable. There has to be something to suggest that the assertion is sustainable. The best evidence would be incontrovertible evidence to support the applicant’s case, but this is rarely available. It would in general be enough if there were some evidence to support the applicant's version of the facts, such as a witness statement or a document, although it would be open to the court to reject that evidence if it was inherently implausible or if it was contradicted, or was not supported, by contemporaneous documentation (see also per as Lawrence Collins LJ states in Ashworth at [34]). But a mere assertion by the applicant that something had been said or happened would not generally be enough if those words or events were in dispute and material to the issue between the parties.”
“…so obviously extravagant, exorbitant and oppressive as to constitute a penalty. Whilst I would be prepared to accept, without supporting evidence, an increase of up to 200% in the applicable rate of interest on default to reflect the greater credit risk presented by a defaulting borrower, in my judgment, and as a rule of thumb, I would expect an evidential burden to pass to a lender to adduce evidence to justify any greater increase, at least where the lender enjoys additional personal and real security for its loan.”