Posted: 21/07/2014 at 12:43
I would go for Nerium Oleander. Evergreen and flowers.
Callistemon (bottle brush plant) is slightly hardier but the flowers more fleeting and is also evergreen.
The 2 above do not mind the winds associated with balconies.
A Fatsia (there are lots of varieties, Spiders web, Annelise and Fatsia polycarpa come very well recommended).
I would not advise to get any of the other plants mentioned above as they are not hardy and London gets air and ground frosts, even super sheltered central London ones. The wind will rip to shreds Canna and musa leaves and will look terrible in no time. You will also be staring at an empty pot come December for Hedychium, Canna and Brugs.
I do like Jungleplants! but a balcony is no good for them.