I'm not sure about The Undercroft taking part of Serpentine Green Building. They occupy two large spaces on the lower level in south end of the shop but above there is KFC, Vivacity Library and some other retail places. Correct me if I'm wrong but point would be more adequate that building part.

Does Barnsdale Drive has no. 13? There is 11 and 15

Hi Bernard,
yes, there is some detail that I have not tagged.. I will do so in the near future