Given the barrier's life is limited it seems odd to commit to a bridge who piers match the fomer's so exactly.
I'm afraid I really struggle with this kind of architecture. Though less wilfully different than many, those angles and facets - however justified - don't make for a settled experience. That atrium appears confused and confusing, and hardly conducive to easy navigation (and it won't win any prizes for signage - ukk). Im not sure it's very 'civic' either. Hopkins' work for Brent seems more fitting in every respect.
And a shame to lose Hounslow's good, mid-century Corporate Modern old complex.
In ordinary suburbs - where gardens are already blighted by large sheds, illegal builds and more - this will mean more concrete, less green space and more problems for neighbours. A shame.
WCC could always refuse listed building consent. That would be interesting.
As a piece of architecture this looks good. The facades are rich and interesting, and I didn't even know Norman Shaw had a courtyard. The reality of the lovely pathways etc won't emerge tho as that area is locked down tighter than you know what and no public access is permitted beyond the pub garden in Derby gate or down cannon Row. Clearly it's a tricky brief but it looks good. As for it being temporary, it won't be demolished but simply re-used, surely.
The only real issue is that gutting a listed building isn't really acceptable.