Re: Chewing Gum
I have been Cabin Crew with BA for six years.
I have never seen a collegue noticaby chewing gum in the cabin while serving a passenger.
As for the question as to whether we can eat in public:
"Staff in uniform must not consume food or drink while walking in a public place. Chewing gum, eating sweets or snacks in uniform in public is not permitted. Staff who take a meal at a public restaurant during their duty must behave with discretion at all times."
- BA Uniform wearer standards booklet -