I think a gentleman is someone who holds the comfort of other people above their own. The instinct to do that is inside every good man, I believe. The rules about opening doors and buying dinner and all of that other 'gentleman' stuff is a chess game, especially these days.
Crossrail is a prime example of infrastructure. It is a rather deadly word, but I think it is exciting stuff, the civil engineering which makes Britain tick - the bridges, tunnels, power and water networks, which bind us together.