Anytime you are a shareholder in a business and your income is derived from profits and/or dividends which are contingent on a number of factors then lots of difficult questions get asked by banks. For a start most retail bank workers like run of the mill PAYE customers. They are dim at best. Anything to do with a company makes them nervous.
For a start your accounts are unaudited which means they will probe them closer. Then assuming they understand what block hours are and how your revenue stream is generated then they will start asking probing questions like how can you prove that your block hours will be x amount next year and the one after etc etc. Then you will go and ask Brookfield or FR for a nice letter to provide some level of comfort and they will no doubt tell you to go get stuffed as they don't want you to in turn use that against them at a later date should your hours not get up to your and your banks expectations.
Your best bet will be to canvass your colleagues and hopefully you will come across a friendly bank manager somewhere in the UK that understands the ins and out of Brookfield.