Assume 2 hour commute by car train and tube 
Option 1. Tues Wed Thurs on the basis that it is good to have three days in a row, don't want to travel on Friday and traffic generally busier on a monday?
or Option 2. Mon Wed Thurs or Mon Tues Thurs on the basis that it is useful to have your days off split up?
Have never worked fixed days part time before so any thoughts gratefully appreciated.