I have looked at a map and there is a village called HEPPLE about 14 miles NW of Morpeth. If you put HEPPLE Northumberland into Google it will come up with the correct information.
I cannot explain where the 'F' fits.
Edward.

The cancel is a Circular Combined cancel. There were four (4) Post Offices in Abbey Wood S.E.2. The S.O. 'Sorting office' refers to the Main Abbey Wood office. The other three (3) were at Bostall Lane, Bostall Hill and Wickham Lane.