As the purpose is commercial
Are you sure about that? Ask yourself if it really is commercial use.
The definition of commercial use is if you are receiving valuable consideration (money) in return for the purpose of the flight. Or if the end result is shown on advertised video channels (Youtube etc).
It could be that if you are only using it for your own business use and no one else is paying to see the footage then you may not need to get any permission from the CAA. It would be considered as non commercial.