OK - in terms of how to object and the grounds that you can object under, the link here from the CAB sets it out as well as any other resource that I can direct you to, see here:
The strongest arguments being the lack of equity (therefore no benefit in the order), the impact on you and the other creditors point. My view is also it's a relatively low amount and a charging order is not proportional given than an instalment plan could be set up to pay this off in a relatively short period of time.
You make the representations in writing, but you should attend in person.
I hope that clarifies the points for you?
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