Orchards heating system

This is a new build house to near Passivhaus standards. I am looking for someone to design a heating and cooling system for the house. I envisage a reversible air source heat pump, feeding a hot water cylinder and a system of (possibly) trench radiators. The house will also have a MVHR system. Being built to such a high spec, it will not need much heating, but I am very keen that it have the ability to be cooled as well as heated. I presently have a Passivhaus engineer working out the thermal performance of the house, which should be avalable n 2 weeks. I am looking for someone with experience of heat pumps and (possibly) trench radiators. Full dwg cad files are available.