At time of writing, just seven – seven – kits can be sold legally in Britain today, to plug-in without an electrician’s approval. Officials have not denied this. It’s no wonder the Government appears slightly coy about pointing people to the official dashboard monitoring this stuff (ENA Connect). It tells you if products meet the new ‘Plug-in Solar Device Interim Product Specification’.

Every retailer – and there are many – that fails to make clear whether their devices are compliant for installation without an electrician is failing the public.