I'm flying to London in the fall and it will be my first (and probably last) time in a first class seat on BA. I see they give you lots of goodies I've never received in the peon section of the plane. Blanket, pajamas, slippers, headphones, amenity bag... Which of these items can you take with you and which do you have to leave on the plane? Don't want to get nabbed for taking a blanket that I was supposed to leave behind! Please help, don't want to look like a newby even though I am!