This may not be fully identifiable from the photos here but hopefully the (edited) field notes provided will also help people agree the ID
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I was thinking of popping down there tomorrow, looks like you've saved me a journey
What's it like for insects down there?
latest pics and diptera videos
Unless you are lucky you will have to put the hours in for the crake (I spend about 8 hours in total on site over two days to get it for around 30 seconds).
The site is always a good one to visit anyway even without the excitement of a rarity.
Never seriously surveyed for insects there but there are plenty of odonata around, loads of butterflies, and lots of calling orthoptera (http://www.ispot.org.uk/node/295741)
At the moment there are quite a few caterpillars of the nationally scarce Reed Dagger (http://www.ispot.org.uk/node/295738) around - quite easy to spot to.
Lat/Lng: 51.4953, 0.2148
OS grid ref: TQ538796