Security idiots
All you need to do is tell the half-witted idiots that the toothpaste or other items are to be stowed in the baggage hold and cannot be accessed in flight, this works at the better airports in the UK.
It won't work in Manchester they are a bunch of Nazi's without the sence of humor.
Howerver these items should not be taken from the crew of a private flight and I would be inclined to invoice the airport for the things that they have taken in error, you probably won't get the money but it will cost them a fortune in administration dealing with the invoice!