My understanding of the law is that you can't
directly challenge the High Court writ of control, as the Court acted correctly in granting the writ based upon the fact that you'd not complied with the terms of the original County Court Judgement.
However, if the CCJ was issued without you ever being notified that it was being applied for (and thus giving you no chance to have your say in the County Court), you might be able to apply to the court which issued the CCJ to have the judgement set aside pending a fresh hearing. That would then enable you to challenge the writ of control in the High Court.
If I've got that right, you'll need to make TWO court applications. The first one needs to be to the High Court, in order to obtain a 'stay of execution' (preventing bailiffs from seizing your goods while the matter is being sorted out). Then you need to apply to the County Court to get the CCJ set aside.
See here
https://www.nationaldebtline.org/fact-sheet-library/high-court-enforcement-ew/
and here
https://www.nationaldebtline.org/fact-sheet-library/setting-aside-a-ccj-ew/
(Those links go to the website of a charity helping people with debt problems and so, unlike many other 'debt assistance' websites, they're not trying to make money out of you. You might find further useful advice on their site , on the phone lines or through their email support:
https://www.nationaldebtline.org/ )