How can creditors reduce the risk of a fixed charge being characterised as floating?

The determination as to whether a charge over a valuable asset is fixed or floating can be crucial to a creditor's recovery in an insolvency. To have two cases over the course of little more than a year providing detailed analysis of the nature of fixed and floating charges is indeed a treat. Are there any practical steps creditors can take to reduce the risk of a fixed charge being characterised as floating?

Fluctuating assets?