I caught some photographs of a second bird among the damson blossoms on Sunday.
Edited to say that several followers of @wildlife_id inform me that it's a Dunnock. I'm not aware of having seen one of these before, perhaps I have mistaken it for a female house sparrow in the past. Very pleased to be adding a new label to my list in the sidebar.
Photo data: 13-Apr-2014, Digital SLR, allotments, Wiltshire