I got caught up in the fun on SWT this morning. Having started in Vauxhall where there was little indication of any problems, I arrived in Clapham Junction to find my train was advertised as one minute late (not unusual) until two minutes before departure when the dreaded 'Delayed' appeared. I decided to wait it out - repeated announcements of emergency engineering work at Wimbledon weren't particularly helpful - and eventually patience was rewarded and my train arrived. However, it was getting to the point (another 5 minutes would have just about done it) where I was considering whether the journey was worth it and it would have been better, in terms of what I needed to do, to have given up and returned to London. I've been in the position of a delayed train at the start of a journey making the reason for travel not worth it and had no trouble obtaining a refund, but was wondering what the rules are for partially completed journeys.