I tentatively believe this is a small white too, because of the wing shape and the dark scaling beneath the cell of the hindwing. Responding to a recent posting by Dave I noted that small white has a fork in vein 7 of the forewing, a feature useful in distinguishing small white from southern small white where that species occurs, but I have since checked my own pictures and found that the large white has a similar fork, so that is not decisive here:
![Image](http://www.guypadfield.com/images2007/brassicaeapex.jpg)
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(Certified large white)
The real question is, however, is this: what was a small white (or a large white) doing resting in a shed in January?? Neither species hibernates. Was it a straggler from 2006 or a precocious individual from the 2007 season? I suspect the latter is more probable but I have never come across a small white before March (in the UK). Very interesting!!
Guy