Thank you for the previous help.
I have come back to the issue with
Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\bjh001\admin\vehicle_Insert.php:6) in C:\xampp\htdocs\bjh001\admin\vehicle_Insert.php on line 425
I have followed your advice ref showthread.php?t=19285 to no avail and have noticed that the error shows only after adding the MRT for the options.
I have added the vehicle_insert page as a zip file with the hope that you could take a look at it for me.
Your time is very much appreciated.