human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Station, Services, Local authority, Zone 2007, Zone 2008, Zone 2010, Zone 2013
###Question: Which Zone 2008 has Services of greater anglia, and a Station of cheshunt?
gpt
SELECT Zone 2008 FROM table WHERE Services = greater anglia AND Station = cheshunt