There may be other circumstances and sources of information known to billing authorities which are relevant to identifying whether any of the proposed arrangements has been made.
Mae’n bosibl bod amgylchiadau a ffynonellau gwybodaeth eraill sy’n hysbys i awdurdodau bilio sy’n berthnasol i ganfod a oes unrhyw rai o’r trefniadau arfaethedig wedi cael eu gwneud.