@Kenneth ******
I had a close friend who worked with Border Force. He assured me you can and gave me a copy of the declaration form in case I needed to take $10,000 or more. If you don't have one filled in, when they ask if you are carrying $10,000 or more and you answer yes, they will take you aside and have you complete the form. Before you give misinformation, go to the web site and check.