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24.vi this year, from a garden backing onto scrubby shingle and woodland. Clearly a dark basicosta, and (this one I am not 100% sure about) no discal bristles on tergite four (at least nothing as long and strong as the marginals). I've shown some poor images of basicosta, tergite four and genitalia below for comment, but this one will probably have to go to ChrisR at some point.