I accept that from time to time I have to give evidence as to who I am. Sometimes this consists of walking past someone who can see my face, sometimes it consists of me saying who I am and them believing me, sometimes it consists of me presenting a business card or invitiation (with no photo on it) (and this even works for some royal events), for getting into commercial aeroplanes (and, OK, Buck House garden parties) I need to show a passport.
All of which I consider proportionate. I do not consider giving anyone my fingerprints proportionate - fingerprinting is what is done to criminals.
(Having said which I was fingerprinted on arrival in Japan. It was that or turn down a trip which was mostly paid for by someone else.)