I went to a marvellous party (2)

In the sometimes odd world of construction, they call it "practical completion".  Lawyers enjoy debating its precise meaning, but it's probably better defined by negatives.  It means a building is handed over from builder to owner when it would be impractical or inconvenient to delay for minor reasons such as single items of missing or defective work, e.g.paint marks on door furniture.

In the construction world, it's also the occasion for a nice party, and yesterday there was one at Broadcasting House, to mark the handover of Phase 2 of the redevelopment. The BBC's Chris Kane has more detail on his blog, and I've "borrowed" this excellent photograph, taken at the end of last month.  It looks good from many other angles too, if you're in the area.  Shape and strategy from Sir Richard McCormac of MJP, followed through by Sheppard Robson. The redoubtable Lucy Homer worked for both and deserves more than a mention, as does Peter Frackiewicz of Land Securities, who sneaked me in to the "do".

  

• Thursday update: There are more pictures on the Guardian website