Every authorised firm must meet the threshold conditions when it is authorised and for as long as it holds permission. For FCA-only firms they are location of offices, effective supervision, appropriate resources, suitability and business model. Walk through each one with the same scrutiny your case officer will apply, and gather the documents that show you meet it.
Milestone 4 of 7
Get FCA authorised
Test yourself against the threshold conditions
Gather evidence that you meet each threshold condition, and fix the weakest one before you apply.