My computer balked at the prospect of downloading umpteen pages of legalese, but the impression I got was that the "judge" didn't believe the claimant was employed by the window cleaner and that at the time of the accident the "employees" were working on "foreigners" anyway, not the employers work, so I presume the window cleaner was judged not to have been the dole cheat's employer at the time of the accident, so therefore was not liable to pay anything.
The £30,000 was what the judge reckoned the injured man would have got if his claim had been successful.
At least that's what I hope the outcome was.
I'd have broken his other heel bone

Cheers

Ian