Number of cars required:

Assume each car can take 5 max (albeit uncomfortably!) for the short journey between drop-off points.

Up to 10 people – we need 3 cars (2 cars at the end to bring all 10 people back).

11-15 people we need 4 cars (3 cars at the end to bring all 15 people back).

1. All cars go to first car park and drop off walkers, they all boot up before the cars depart (drivers keep their shoes on). Also see note A below.
2. All cars go to the end car park and drivers all return (with their boots etc in their hands) to the first car park in one car. Also see Note B below. 
3. At the end of the walk everyone swaps boots for shoes and get into the cars (will be up to 5 people per car for the short journey back) and all return to the first car park, where we all get into our original cars for the journey home.
4. In this way, every driver does an equal number of shuttles. Also at the end of the walk, everyone can get into a car instead of having to wait for a car shuttle activity.

Notes

1. All the passengers who came in the car that returns to the start should put their shoes and a boot bag in one of the cars that will be at the end.
2. All the drivers should take an extra boot bag and extra shoes to put in one of the cars left at the end of the walk (as their boot bag and shoes will be in the car at the start of the walk).  

Car share costs:

• Assume 40p per mile – add up the total mileage.
• Work out cost per car – the drivers get this much back irrespective of how many passengers there are.
• Split the total cost of all cars by the number of walkers (minus the drivers).
• People to bring cash so that we can divvy up the money on the day.

Typical sums: 

• 100 mile round trip = £40 per car.
• 10 walkers, 3 cars = 40 x 3 / 7 = £17.14 each.