Wycombe - if only trains did 75mph until Plymouth. The average speed is about 55mph, past Newton Abbott and much of the line is capped at 40mph. There is growing uncertainty at the future of the railway anyway; the Transport Secretary recently ruled out a diversionary route to avoid Dawlish as 'uneconomical', so it will continue to be at the mercy of the weather and sea level rise.
Groundhog - tried that. Nearest available car was Plymouth, no delivery option to NQY.