Hmmm, your experience was unfortunate but also interesting. I was working in London, a few months ago and one day I had to travel from the city centre to Croydon as I had an appointment at Stephenson House. I got on a train at London Bridge and data was working. If I recall correctly, by the time the train got to Brockley, I encountered data congestion and was confounded by it. I had a very good to full signal all the way from Brockley to Norwood Junction yet could not get anything that required data to work properly. I did some research later and discovered the joys of data congestion. Ironically, a few days later, I was waiting at London St. Pancras, as I was travelling to Derby. Many years ago I was a regular traveller out of St. Pancras and always listened to the album "Wild & Lonely" by The Associates. I'd been thinking about this album that morning and, with ten minutes before train departure, remembered about it. For nostalgia's sake, I stood at the ticket barriers and managed to download the whole album which completed just as the platform was announced. If locations such as St. Pancras are now suffering from data congestion, I can imagine that a lot of people who are there every day of the week will get super frustrated and switch networks.
