1. Mark out on the map where the buses have to stop and the number of players to pick up
2. Split the map up into the 4 parts (like this)

3. Adjust the map sections so it doesn't cover places where you don't have to pick anyone up 
4. For each bus route make the first stop the furtherest away and work inwards to Crawley
5. Using the spreadsheet model check whether routes work
6. Trial and error to get routes working
7. Adjust depature times so the buses don't leave too early (because of age groups) but get to Crawley before 12:00