The TfL single fare finder gives a fare of £1.50 off-peak from Tottenham Hale to West Croydon, if you go through Stratford and use the Pink validator at Canada Water.
https://www.oyster-rail.org.uk/fares-guide/guide-to-fare-scales/
looks like that route is covered by the TfL-Ang fare scale.
But according to
https://www.oyster-rail.org.uk/fares-guide/adult-fares-2019/
TfL-Ang for Zones 2-5 is £2.40 not £1.50.
https://www.oyster-rail.org.uk/fares-guide/guide-to-fare-scales/
looks like that route is covered by the TfL-Ang fare scale.
But according to
https://www.oyster-rail.org.uk/fares-guide/adult-fares-2019/
TfL-Ang for Zones 2-5 is £2.40 not £1.50.