Unfortunately Murraymints the law does not regard what you or I think as the definitive test for a reasonable person, even if we consider ourselves to be reasonable, this hypothetical person was I think first used in Vaughan V Menlove 1837, regarding a Hayrick and the mythical person on the Clapham Omnibus was I think first used by Lord Bowen in 1871.
You may expect by this time a simple definition of a reasonable person’s actions in most situations would be available but this is not the case, the Court, if it goes that far, will decide what is reasonable.
In Consumer law there are other factors not least the price paid which will also be considered.