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Not Ephemerella subvaria. That is a north American species only. It is in the super family of heptageniidae and is very closely related to Maccaffertium. If this were a sample from NA I would call it a Maccaffertium for sure. All Ephemerella SP have three tails not two tails as yours has.
looks like this one http://www.empirepestcontrol.co.uk/pests...
Lat: 51.86, Long: -4.30
Spotted on Oct 10, 2013 Submitted on Oct 12, 2013