I would simply turn up in court, with the various invoices from the other tradespeople that you have had to use, and photographs of the 'problem' areas left by the original company. No video needed, a photo of a spirit level against a out-of-true wall is perfectly adequate, and a photo and description stating 'loose shower rail'.
You don't submit a counterclaim unless you actually have something to claim off them monetarially - as you've held back a sum of money on the basis of poor / incomplete workmanship then I assume that sum has been used to pay for work/reports carried out.
So quite simply you turn up in court, show the shoddy job that they did (the sheer amount of times they've had to come back supports your case, as if they'd done the work properly they wouldn't have to have done so, along with the photographs and the reports from the other companies), explain that you'd eventually had enough, and ask the court to dismiss the case.
If, on the other hand, you've got quotes from other companies to do the job properly, and those come to more than the sum held back, then yes, you'd need to submit your own claim / counterclaim.
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