Hi Sarah,
I stupidly used to travel upto 40 miles sometimes just for a blow dry but that was a long time ago now, these days for hairdressing about 20-25 miles but won't do that far for just 1 client, they need to fit in with other clients enroute or not at all. New clients I charge 40p per mile over 10 miles. Hair extensions I will go further, 40 miles is the furthest at present but again I charge her £25 for travelling, which suits her as she was getting a train to much further away before she found me.
Hope that helps x