[larsrindsig]

A full-size Swaine Adeney Brigg umbrella sceurity would probably assume you wanted to stab the pilot in the neck with. Besides, would it even fit in the overhead lockers? When I fly I have plenty of other nick nacks to keep track of and carry - I wouldn't particularly want to fuss over a 200 quid umbrella. Get a cheap foldable one and put it in your suitcase.