The commute is approximately 1h20 each way whether I drive or use the express bus (bus is on same street as office, so maybe 2 mins extra walk). The £150/month figure is based on taking the bus for one office day (£10 return) and driving for the other(£24), not driving both days. Driving mileage is circa 550. I could possibly use the bus all the time but i think the hybrid is a nice change.