Weather Location Hevacomp Part L

There seems to be no option to choose Cardiff as the building location in a Hevacomp England Regs Part L analysis (called weather location in iSBEM). Although my building is in England, using the weather location nearest the subject building based on post code (using the procedures required by my accreditation body), Cardiff should be chosen. It is available for selection in an England Regs iSBEM analysis but apparently not in Hevacomp. Why is this?