Does Seatfrog really get you cheap train upgrades?

Simon Calder answers your questions on train seat upgrades, passport validity and the EU maximum-stay rule for UK citizens

Using apps to bid for middle-of-the-day trips may be worthwhile (Simon Calder)

Q While travelling first class on Avanti from London Euston to Wilmslow, a wonderful member of the crew checking tickets told us all to download the Seatfrog app and bid for an upgrade! He said: “If you pick the right timings you will more than likely succeed! You’ll save hundreds.”

I think he may have been close to retirement to share this information with passengers. We have all now got the app. Have you tried it, and does it work?

Barbara K