From Thornton Heath train to Balham Underground Station, Tube to King's Cross St. Pancras Underground Station, then walk to Tube Map. 44min £9. From Thornton Heath train to East Croydon, train to St Pancras Low Level, then walk to Tube Map. 46min £8. From Thornton Heath, Parchmore Methodist Church line 450 bus to Crystal Palace Parade (SE19), bus to Pentonville, King's Cross Stn York Way, then walk to Tube Map. 1hrs 12min £1. From Thornton Heath taxi to Tube Map. 32min £35.