I can. It’s £2.20 for the evening peak trip to Brentwood and £2.00 for the off-peak return trip later on. These are the TfL-LU fares for zones 7-9 which apply for extension fares on the EL between Harold Wood and Brentwood. You can see the fares by putting Moor Park to Amersham into the fare finder.
Hope that helps.