The plastic wrap was an attempt to contain the mess. Why any firm would continue to try and deliver the wreckage is odd, unless they they were unaware of actual breakage of the internals.
I'm not sure about shipping practices in GB, but it isn't odd at all. In fact, it is the norm in the US when a forklift driver drops, spears or crushes a crate or skid of packages. Or the package shifts in the trailer. The SOP is to Contain, Mask, Pray and Deliver. You can tell this happened here:
1) Contain. The loose wrap and skids propped up inside indicate that the job done by PM was destroyed. This was an attempt to prevent any loose parts from getting loose upon delivery. This is not designed to mask damage. It is designed to protect them from you making a claim that something was missing - damaged or not. If it was damaged, the shipping company will play dumb and blame the manufacturer.
2) Mask. The damaged skid was loaded with its best side showing on the truck. This is a tactic designed to do the following: get it off the truck (its a lot of trouble to get it off the truck). Once it is off the truck, the OWNER now has the burden of inspecting and deciding to refuse. I'll wager that driver played dumb while
@jeremysf weighed his options.
3) Pray that you are a dupe and accept the shipment and won't go travel through the hellscape of filing a claim. Don't answer their prayers.
4) Delivery! All is good. "Recipient inspected and accepted the shipment as is." Nothing to see here - moving on.
It's cynical, for sure, but this is what the shipping company defaults to when the SHTF and they know they are on the hook for it. Don't find yourself downwind from the fan.
@jeremysf - good call. Sorry for the grief you are going through but in the end it will all work out in your favor.