I too was a resident for over 25 years and had benefited from one of the lowest shire rates (council tax) around.
The latest publish accounts for LBC I can find is for y/e 18/19. Looking at the Debt relating to Airport Debenture to LALL, interest charged then Share Dividend & rents going the other way I cannot see a great issue, they are servicing the Debt, but maybe I am seeing outdated information? I am no accountant either.
The Debenture seems to be mostly covered by the Special Infrastructure Rate Loan Scheme operated by Central Government at very favorable rates but had to be started before 2022 to qualify hence the hast to get the DART up and running before .........T2.