Preferred methods of communication are email or SMS.
Payment by cash or bank transfer, by the end of the day of the session.
I understand that illness happens and that life sometimes throws unexpected events our way. As a guideline, this is what I think is mutually fair in terms of tutoring attendance:
If a tutoring session is cancelled on the morning of the session, there will be no charge.
If a session is cancelled after noon on the day of the session, there will be a £15 charge.
The viability of the continuation of the service may be in question if there are repeated cancellations.