The order numbers are formatted as FLPPPPIXXXXXXX where...
F - first character of first name
L - first character of last name
PPPP - last four digits of post code
I - last digit of the script ID
XXXXXXX - 7 digit incremental number
F - first character of first name
L - first character of last name
PPPP - last four digits of post code
I - last digit of the script ID
XXXXXXX - 7 digit incremental number