FCA Authorisation Fees
https://www.fca.org.uk/firms/authorisation/apply/fees
The firm will need to establish what activity group they fall under as per FEES 4 Annex 1A. Once you have identified the activity group(s) you fall in you will need to determine the pricing category you fall under, as per FEES 3 Annex 1 and then to check the cost of this, check FEES 3 Annex 1A.