I left my backpack on the train today.
Thankfully there was nothing in it, but it was still worth around £40. I can't believe it. About 10 minutes after getting off I suddenly remembered I wasn't wearing it.
Reported it to lost property, and the staff were incredibly healthful about it (probably secretly thinking 'we've got another bellend who has left something on one of our trains...yeah it's a bag, people at Victoria may think it's a bomb...'). Shall just cross my fingers and see if it's handed in. It's North Face, so probably not...