In message , at 10:17:56 on Fri, 9 Jun 2017,
Basil Jet remarked:

Ongar's not as big as you think, and the rail journey was very slow
with almost no additional catchment until Epping. It's far easier to
drive to Brentwood station.

Or Shenfield, which has much faster trains to London.

Having lived in the area for many years, Brentwood has a bigger and
cheaper car park, and more trains (if you count only the fasts at
Shenfield, and if you want a slow then why go out of your way to
Shenfield in the first place).
--
Roland Perry