What became of orphaned children in the days of Victoria, William IV and the Georges? Did they all end up in the hands of Fagin and his ilk? Many did, but a few lucky ones found themselves in the Orphan Working School.
From the British History Website: "the Orphan Working School, which was originally established in the east end of London, as far back as the year 1758, but was removed here when it had nearly completed a century of existence. Here orphans and other necessitous children are clothed, educated, and wholly maintained, from seven years of age until they are about fourteen or fifteen; and the number of children usually in the school is about 400. At the age of fourteen the boys are apprenticed, and the girls, who are all trained for domestic service, remain for a year or two longer."
From the coordinates given you should find yourself in Maitland Park, outside a nice looking modern care home. But a modern care home with old grand looking gate posts? These gate posts mark the entrance to what was the site of the Orphan Working School, at one time one of the largest and most well known charities in the metropolis.

Although of the four gateposts you see, only the second from the right seems to be in its original position. I think that the one next to it was moved roughly between the disabled parking bay and the ambuland drop off area. And sadly the capping stones and lanterns are long gone. Compare the view now to the photo above.

This is the view from further up the road, outside what is now Beech House. I think the other two gate posts would've been roughly where the viewpoint is. It was later extended to accommodate over 500 children and amalgated with the Alexandra Orphanage, but Hitler had no time for orphans and the building did not survive the war. The remains were cleared in the late 1940s or early 1950s to make way for the housing you see now.

This is quite a caring ares - there are almshouses to the north and a large bronze loving family to the south.
The original boundary stones marking the edge of the school's land can still be seen at the bottom of Maitland Park, alongside the gable end of the church. And not far from another cache.
it's also interesting to note that one Ebenezer Maitland was once the president of the Orphan Working School. With altruism comes immortality!
The small magnetic cache is easily accessible by all, but please do be discrete.