Check out the free website (donations welcome) https://kentwalksnearlondon.com/walk-24-knockholt-pound-chevening-circular-5-miles/
It is around 50 minutes by car from Newham. There is railway station about 2 miles away so you could extend walk if using public transport.
I think I saw a Battle of Britain Flight Spitfire flying overhead but not sure and I was too slow to take a proper photo.
Chevening House, dominates the skyline for much of this walk and is the marvellous "grace and favour" home for the current Foreign Secretary. I can think of better uses. Just saying...
The village pub, Three Horseshoes, was shut but stopped off at nearby village pub, The Bulls Head, for a beer, which was very nice and the food looked excellent.