A look behind the scenes of gov.uk. I like their attitude to Photoshop comps:
We don’t want a culture of designs being “thrown over a wall” to a dev team. We don’t make “high fidelity mock ups” or “high fidelity wireframes”. We’re making a Thing, not pictures of a Thing.
We don’t have a UX Team. If the problem with your service is that the servers are slow and the UX Team can’t change that, then they aren’t in control of the user experience and they shouldn’t be called the user experience team.