[freetip]

I was planning to do it for just the switch alone tbh @mothered  and say the other items were in the box

It's too heavy for the PEB, namely If an Investigation Is opened and the weight Is cross-checked with the carrier.

If I don't answer the door when the parcel arrives is it slim chance they'd just leave the parcel on my doorstep?

The possibility exists, but It's almost a certainty that It will be marked as an undelivered consignment, and taken back to the depot to reschedule the delivery time & date.

I saw on another website someone said that they'd received their items , but one of them was the wrong item. Is this a likely outcome or no good?

I can help you, with refund and replacement or either DNA. Send me your telegram and I will Help you