As good Londoners, you'll know all about being able to claim a refund when the tube is delayed by 15 minutes or more. If you didn't, we're not going to tut at you - it's not something TfL goes out of its way to publicise, and for years a search for 'refund' on their website returned 20 policy PDFs. It works like this: if the journey you're making is delayed by 15 minutes or more (with certain 'out of our control' exceptions), and you remember to fill in a lengthy form requesting precise details within 14 days of the incident, you'll be sent a voucher to the value of a single fare for the delayed journey.
Let's be honest, it's a faff. Even with a couple of recent apps, getting a refund often requires a pigheaded determination to screw TfL for every last penny in recompense for suffering incurred. But these are straightened times, so a new website might come in very handy. mytubewaslate.com only asks you to fill in your details once and tell it which journeys you make most often, so it can email you when a refund-worthy delay occurs. Or you can search for delays and be reminded that way. You still need to claim within 14 days but it takes a lot of the hassle out of getting that £2.70 back. It might not sound a lot, but we once got so hacked off with the Northern Line we claimed £20 in a month - that's a fair bit off your next travelcard.