Not most businesses. Perhaps ones very badly run.
My company was peripherally involved in a cable strike some years back (serious injury / no fatality).
Nothing to do with us.
Our Directors got seriously grilled by HSE, and it was hugely stressful, and expensive (time lost to dealing with things/insurers/lawyers).
I can't remember what the fine was for the contractor, but it was not a token slap on the wrist.
The cost to fix the asset can be very high, and your insurer may refuse to cover you.
If you failed to do a search, you'll (almost certainly) be found negligent (which probably invalidates your insurance, so now you have the repair cost), which means HSE prosecution, huge fine and potentially a jail term.
For a small to mid-sized company, the fine will probably kill the company.