When I saw your post I felt compelled to answer. Although I live in Wiltshire now, I used to travel to that station daily for quite a few years on my way to work for the London Borough of Barnet. I don't recall the mound you mention but I do recall the stream and the 'open space' it ran through. An amazing stretch of meadowland - the only place I have seen a kingfisher and somewhere I have fond memories of.
One lunch-time I was walking there and one of the fields, full of dandelions was covered in red admiral butterflies. It was a fabulous sight and I went back the next day to relive the experience but the council had cut the grass.
A bright, frosty morning many years ago, I walked along there before going into work - the sun came up and I literally saw the light. It was February 2nd (which I later found out to be Imbolc) and I had my 'road to Damascus' in reverse - that was the morning I quietly became a pagan.
Thank you for reminding me of a place that used to bring harmony to my working day - I haven't thought about for quite a while.