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Hi John

This looks like Lonchaea sylvatica to me. As the key states it is the only Lonchaea with black tarsomeres and black fringe to calypteres. No British Dasiops female has such long setae on the aculeus or such a long antennal flagellomere. The colour of the setae on the aculeus obviously varies a bit.

Locating the post - stigmaticals of Dasiops can be difficult if you are not familiar with the genus The key to Lonchaeidae genera at http://lonchaeidae.myspecies.info/key-genera contains a link to a diagram which may be useful

Iain