Not sure what I am missing in their description, similar products are priced between £850/950 everywhere else.
1 x Core i7 6700 / 3.4 GHz
DisplayPort - Yes
Form Factor - Small Form Factor
Experience top-notch productivity plus industry-leading reliability, security, and manageability, plus a unique portfolio of solutions with the powerful HP EliteDesk 800 TWR, HP's most expandable enterprise-class PC. Blast through your most demanding challenges with the uncompromising performance of 6th Gen Intel Core processors,1 Intel HD 530 Graphics, and optional high-end discrete graphics and HP Turbo Drive. Help protect your PC and maintain maximum uptime with a suite of solutions that help stop security breaches, including HP BIOSphere with SureStart.
You can read more details in the link. As I said it looks too good for money and I failed to spot why, hence posted here.