The UK Civil Aviation Authority is currently running a consultation over a proposed review of statutory charges. The over-arching review and the forms to respond to the consultation can be found here.
More detail on the charges for General Aviation including Air Displays can be viewed by downloading the PDF from http://www.caa.co.uk/uploadedFiles/CAA/Content/Standard_Content/Our_work/Consultations/2016/Files/GAS%201718%20Enclosure.pdf
The BADA committee plans to respond on behalf of the Association but everyone should make their own individual responses so that the true weight of reasons why further increases in the air display arena would be counter to safety etc. The Consultation closes on 7th February 2017 so there is still plenty of time to construct full repsonses to the consultation.