Sorry class for being so late with the answers.
willa ? and an extra treat ??, as I'm going to use your explanation, it is better than the one I had ready.
Answer: 325
A handshake is shared between two individuals, so that's half of 26 which is 13.
Since you are included in the 26, you must subtract yourself (you don't shake your own hand). That makes it (26-1) x 13 which equals 325
Brilliant wila! ?
To think that London, or anywhere else for that matter, does not belong to any one demographic