Thank you for contacting us on 13th April 2016 in regards to the expansion of the Key smartcard travel area.
On 3rd March, Abellio Greater Anglia railway launched their own smartcard product, and an reciprocal agreement was reached to make their smartcard available on some Great Northern routes and vice versa.
Unfortunately this does not include the journey Hertford East <-> Liverpool Street. Hertford East is not a Key-enabled station, and so you can neither scan your Key nor purchase Key tickets starting from this station. Hertford North (a Great Northern station) is Key-enabled, however, and you can still buy tickets into London from there.
I hope this information helps. Should you have any further queries about the Key, please do not hesitate to contact us again.
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