I found the spec for the HAN (Home area network) as defined by the UK Government and it does use Zigbee. I would expect Loxone to come out with something via Air Base or another box or a 3rd party integrator to something to bridge to the LAN.https://www.smartdcc.co.uk/media/245019/2015_05_19_han_consultation-dcc_response_vfinal.pdf
I quite like the idea of being able to trigger energy price changes into heating logic.
http://www.chameleontechnology.co.uk/connected-home/