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It does seem to be P.hartigi, but what is the 'drop down list' referred to?
The drop down list which appears when you start to type in a species name. By selecting from the list you select the correct nomenclature and it will then link up with the NBN etc. In this case it would appear the name didn't appear due to my mis-spelling the name, so I have just corrected it.
Lat/Lng: 51.4423, -2.7178
OS grid ref: ST502717