about 3kW of solar PV under the FIT scheme, another 1kW since 2003. 3 Solar thermal panels and 2 wind turbines (future energy), both about 4 years old, one already seized and useless!
Lagged the freezer with ecotherm, internal and external insulation, basically putting a jcket round the house. Downstairs loo flushed with bathwater. 4 IBCs acting as water tanks
Look out 2nd hand IBCs, very cheap and perfect for external tanks for grey water recycling .£100 for a 2 m3 system including pipes and valves or £1000s for a bespoke "proper" system. Flush can end up smelling of bath salts or ponging a bit but its a toilet!
Freezer in the garage? Smother it with slabs of 2 inch insulating board (not the grill at the rear) potentially turning an A rated freezer (aren't they all) into an A++ freezer for not much money. Lasts longer and runs cheaper as less work on the motor/compressor