Male & Female toilets available in Subway, exit 6 Whitehall West exit.
Charge of £0.80 for single entry.
Please see to photos attached for subway and entrance from road

via StreetComplete 62.1

Attached photo(s):
https://streetcomplete.app/p/321275.jpg
https://streetcomplete.app/p/321276.jpg
https://streetcomplete.app/p/321277.jpg
https://streetcomplete.app/p/321278.jpg