The architects describe it as:
a garden pavilion containing a small office alongside garden storage space located to the rear of a 1950's terraced house in St John’s Wood with the brief requiring the shoffice to be conceived of as a sculptural object that flowed into the garden space.
The glazed office space nestles into an extruded timber elliptical shell, reminiscent of a wood shaving, and forms a small terrace in the lawn.
Indeed, when you look at it from above and from the house, it almost fills the lawn; there isn't much left. It certainly is a lovely sculptural object, but I wonder if it isn't too much of a good thing. More at Platform 5 Architects and Designboom