I fly into Heathrow from Zurich arriving at terminal 5. My flight to the US leaves drom terminal 3. I just want to make sure I understand correctly that I will have to go through security again at T3, right? Reason I ask is that I was hoping to be able yo stock up on jams from Fortnum & Mason but since that's at T5, I won't be able to bring it in to T3 with me, correct??
Big bummer. Was really looking forward to it.