I agree. Things that are designed to go "BOOM" "POP" "BANG" or otherwise spray flaming and sparkling materials around tend to put the security people on edge (quite understandably, IMHO). They let us slide by because we don't build rockets that intentionally do those things.
Folks on the fireworks side of the ballistics hobbies have to have far more permits and licenses than you can shake a stick at, not to mention more insurance and very regulated and controlled launches.
Let's all plan to just watch the fireworks this year and invite our UK friends to come over and enjoy with us!
WW