This follows the detection of a code error in the Volume Correction Factor calculations which has been corrected and appears to test out OK.
There is a statement in the spreadsheets to the effect that users should cross check any calculations they might depend on before committing to them but I know some people don't do that so apologies for the rror and hope this version proves more useful.
As ever with these spreadsheets, feedback is always appreciated and especially error reporting.
Thanks.