That's the exact spot where we did the berm, you can see the grass grown out because we topsoiled and seeded it when we finished.
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I've just had a look mate and have found the access road. It was off Lower Burnham road overlooking Round Marsh.
If you follow the track from my pin all the way down to the railway you'll see the exact spot where we were working on the track, it was all done on days.
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Yes, there must have been a slip so we built a berm. Just had a quick look on the map and I lodged at the Ferry Boat Inn for a few days, not too far away.
Respect to @Greyman, Rick Minter and Jonathan McGowan for inviting me to an audition of the big cat show. It has certainly opened my eyes to the possibility of the existence of UK big cats, this piece was a particular favourite of mine.