After a bit of research it appears that clubs who are relegated from EFL1 to EFL2 receive circa 12.5% of the £700,000 each team in EFL1 receives.
Clubs relegated from EFL2 to the National league receive 100% of the £415,000 that each EFL2 club receives.
So my basic maths would suggest we get £415,000 plus £87,500 (12.5% 0f £700,000) which equates to £502,000.
These figures may be out of date AND crucially may be entirely wrong.....
I wonder if the former loan from Bond Group was partially repaid by money we received from the EFL after promotion to EFL1....