I know this as 'Fox and Cubs' and saw it growing first alongside the - then abandoned - Swanage to Corfe railway line . . .
Many, many apologies but I have had dreadful phone line problems - changing provider and a phone line that has Had It . . . I have been taking notes over the 3 weeks I had no broadband, so I will post them up later on today, or whenever broadband comes back properly (this is just a "blip").