I don't agree. A passport is the property of the issuing government and I question whether a contracted security person has the right to CONFISCATE it, particularly as in this case it was done out of pure spite and abuse of power. Had the document been requested purely as a form if ID check, that would have been perfectly acceptable.
Anyway I have taken this up with the IPS. I've already received a preliminary response which indicates that they have some concerns about this, and they are going to come back to me now that I've given them further details. Obviously this is confidential but I will post the gist of their reply once finalised.