Udaipur. Thursday, 6.30am. Chilly. Dark. Not many people about, those that are, are wrapped in quilted coats, caps and scarves. We’re in T-shirts. Taxi to airport, flight to Mumbai. Disembark Mumbai a short time later. Just gone 10am and it’s already a sweaty 27 degrees. How is that even possible? Baggage tags have the 3-letter airport code on – you know, like LHR for Heathrow or LGW for Gatwick. Except that if you’re heading to Mumbai then you now have a bag with a label clearly stating “BOM”. Got to see the dark humour in that, yeah?  Brand new metro system, Line 3, the Aqua Line. All the way to…