Just a cut and paste on the relevant laws: Note that it must be "food" or "drink" and the act must be "consume" or "attempt to consume".
Hence, saying "no eating and drinking" is wrong. You must consume "food" or "drink". If you are able to argue that lozenges are not "food", then you will fall outside of the provision.
I'll argue that the explicit stating of "bubble gum" in the subsection (2) means that the legislators have thought that bubble gum (falling under candy/sweets/lozenges etc) are expressly banned; in which case an argument can also be made that similar items not excluded are not intended to be included.
No consumption of food or drinks
14. No person shall —
(a) consume or attempt to consume any food or drinks while in or upon any part of the railway premises except in such places as are designated for this purpose by the Authority or its licensee; or
(b) consume or attempt to consume any chewing gum or bubble gum while in or upon any part of the railway premises.