"In summary, it is likely that the disparity between the standby compass and the primary heading indications was not identified due to a combination of the:
• method of crosschecking the heading indications by use of the word ‘Check’ instead of verbalising the actual indication
• reduced prominence of the standby compass compared to the primary heading indications
• instrument panel check not being fully carried out during pre-flight in accordance with the FCOM, as the incorrect mode was selected on the NDs."
After lining-up they also didn't notice the >30 degree discrepancy between the indicated heading of 193'M and that they were on runway 16.