Last week I featured bigestivediscuit's handbag and in it she carried one of the chicest ways to be organised, a plain covered London a-z! The Philip's maps are plain so "that passers-by are not aware of the user consulting a map".
It is available in six different colours; red, navy blue, pink, brown, green and grey. It has two ribbon markers and an elastic fastener so that you can mark where you're travelling from and too. The best thing about it? It's just £8.99, bargain! I have opted for navy blue.