The coords will take you to a drinking fountain and plaque about a popular novelist who wrote many well known enduring stories. It is worth reading the info on this person. Beyond this is the old Addington Prison and boy may have lived in a place like this for a time.
The find the cache you will need to find some info from the plaque and fountain as follows:
A = How many letters are in the surname name of the boy mention on both?
D = How many letters are in the first name of the boy mention on both?
B & C = The novelist was born in 1BC2
Final Coords
S43 32.A9B
E172 3D.9CC
You are looking for a screw top jar about 300 ml covered in black tape.