http://www.wymetro.com/BusTravel/BusStationsAndStops/LCBS is what you want. Scroll down to see a list of destinations and an 8-digit number next to each one. Click on the number next to 757 and a box pops up with the next buses from that stop (which is stand 15). Or use the journey planner to see the whole timetable for that service. At the side of the main page there's a list of other bus stations (Bradford etc.)