Thank you for your patience
This is a fairly well known scam in the UK. It has been doing the rounds for a while.
It involves a person sending controlled substances to an entirely innocent person so that they bear all of the risk and the package is to be intercepted. Obviously we don't really know how they do the latter.
In terms of search warrants, that is pretty unlikely if I'm honest. However I understand why you were worried about it as a search is never really a very pleasant experience. For what it is worth, they don't usually entirely decimate the place. If you let them in then they don't breakdown doors and quite often they don't search places properly but I understand that it is embarrassing to have police officers turn up and fairly unpleasant to have them search a property.
There isn't really anyway of making certain that that won't happen but what you can do to try to head it off is to go down to the police station and report that you are concerned about this. They may not be able to take any action at the moment but it puts on record that you have complained that you think your identity is compromised and also it isn't really the behaviour of a guilty person.
You can also write to the HM RC address that border control will have given you saying that this package is nothing to do with you and you do not want it and did not order it.
It is quite unlikely that anything would ever come of this but there are steps you can take to make sure.
Can I clarify anything for you?