Read the legislation again, the use of the definition is restricted. Note the use of 'In this Section' prior to introducing the definition to signify that the definition is not to be relied upon universally. A letting of 15 days is still a short term letting, just not one to which the restrictions outlined in that section apply. The alternative is a Part 4 tenancy,Leo you have it backwards. a 14 day stay is regarded as a short term let as defined by law. Short term legislation does not apply to anything in excess of that.