There are two (and sometimes three) operator licence fees payable when applying for your licence.
An application fee of £257 must accompany your completed GV79 form; this fee is non-returnable. Once the licence has been granted, an additional fee of £401 is applicable for its issue.
If you are looking for interim authorisation, an extra fee of £68 is applicable and should be enclosed with an additional INT1 form alongside your GV79.
A fee of £401 is due every five years should you wish to continue your licence.