On a point of detail, Frank isn't actually applying for authorisation as a bank and it won't be entitled to take deposits or hold client monies under the terms of its authorisation (if granted).
The "retail credit firm" designation only came into being in 2008 as a mechanism for ensuring that the various sub-prime lenders complied with the Central Bank's Code of Conduct on Mortgage Arrears - prior to that no authorisation was required by these lenders.
The form of authorisation that Frank is looking for should only take a matter of weeks to process. Really the Central Bank should only be concerned with ensuring that the principal officers of the company are fit and proper persons to operate a regulated business and that the company has the necessary policies and procedures in place to ensure compliance with the relevant Central Bank Codes.
While I have no insight into this particular application, at this stage you really would have to wonder why it is taking so long.