Traffic was more congested than usual, lots of stop-start traffic. The bus in front began to slowly move. As I was about to follow, the Land Rover ran into my back. Thankfully, the impact was low-speed. While conversing with the driver, I noticed her mobile phone was on her lap. I suspect she was texting, noticed the bus move in her peripheral vision, and decided to proceed without lifting up her head. Details have been exchanged, though she stated she didn't 'trust me'. No visible damage to the bike, but it will get checked out this afternoon. Note to self: watch mirrors more often, or get extra pair of eyes installed on back of head.