Tephritid - possibly new to Somerset

I am currently sorting the contents of a malaise trap that was deployed for just over two months last summer at Shapwick NNR in Somerset. One of the flies I have found is a tephritid that seems to key to Euleia rotundiventris and David Clements has said that the photograph looks good to him. As it is so rare or under recorded nationally, I would like further confirmation if possible. In particular, it looks quite pale compared to photographs I have seen of this species. I know some other species vary considerably between summer and winter "plumages" and wonder if this is a similar situation or if it is just a teneral specimen that hadn't coloured up fully before entering the trap. All ideas gratefully received. :-)