Take Junction 29 off the M25 - A127 towards Southend.
2.
Take 2nd major junction (A128/Halfway House turnoff).
3.
Take first exit at roundabout (A128 towards Brentwood). Cockridden Farm can be found 1/4 mile down on right hand side (hidden by a hedgerow of conifers).
If you reach the Essex Golf course, you've gone too far!