If only...
This GPS contract is advertised as a 'catalogue' of hardware to save public sector purchasers from having to do the legwork to compare different vendors' products and prices. But nobody is forecd to buy from it, and if [insert name here] Council don't like the brands in the catalogue, they can just continue to buy the same as they've done already. The absence of key names from the GPS award (direct sales from Dell and HP?) suggests that it'll present a poor alternative for buyers who are comfy with their current provider, even if resellers are touting the same brands. There's no saving to be had if you don't buy from it.
As for saving 20% off the opening prices... well, dur! Which vendor would realistically start an auction event with their lowest possible price, before seeing what the competition is trying?
Beer, because it's Friday, beer o'clock.