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There is a lot of confusion here!
The tree Horse Chestnut is Aesculus hippocastanum. The moth of the same name is Pachycnemia hippocastanaria. I don't see a moth in your picture, and the related observations are of the tree, at least some of them with the Latin name of the moth, as here.
The observation is in Invertebrates, so is there a moth that I can't see?
Why 'Horse Chestnut' does not offer the Latin name of the tree, but only of the moth, is a mystery, and certainly not helpful, but the fault lies in the NBN dictionary that lies behind the iSpot system.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
I have tracked down the problem - the dictionary reads 'Horse-chestnut' as being the tree, but 'Horse Chestnut' as the moth. I will flag this with the dictionary team, as it is clearly unsatisfactory.
I am entering in the records for the bioblitz, just had the common name for this one, will change it
To find out about what's going on in the south west check out http://www.ispot.org.uk/forum/8409
Lat/Lng: 51.346, -2.6071
OS grid ref: ST578609