Hornchurch Country P ark is a park on the former site of Hornchurch Airfield , south of Hornchurch in the London Borough of Havering , East London. The River Ingrebourne passes through the park and if forms part of the Thames Chase Community Forest . The most popular part of the park is to the west of the Ingreborne , where the ground is flat and paved. The woodland to the east of the river is somewhat inaccessible while some southern parts of the park that reach into Rainham have been used as landfill.