I very rarely cancel a session. Even when I was horribly unwell I used to drag myself to see T1. The need was so strong that I just had to get there. I did cancel one with Ts when I had flu but as I didn't pay her anyway it wasn't an issue. I think T3 had a policy about cancellations on the day but I never cancelled. I haven't with T4 but I strongly suspect she would just suggest rearranging rather than charging me. I see an alternative practictioner and because she knows me we will always re-arrange a day rather than ask me to pay for the missed session.