It's a cop show on SKY (my mates). Quite fun, and has made my kids a bit more interested in the power of maths, as opposed to statistics, which is anything you want it to be.
And what I have read here -
Solar panels won't save the planet - seem to be matters of mathematical fact, and hence environmental (beyond the financial option) value:
"... a rather more general question-mark has been raised over their value by one of the country's genuine experts, Abu Bakr Bahaj, a senior lecturer in civil engineering, who based his figures on the experience of a large panel installation at his university in Southampton.
Since solar panels in Britain generate, on average, only 20 per cent of their potential maximum output (at a cost of £4,500 per kilowatt of installed capacity), he reported in the journal of the Institute of Civil Engineers that the average pay-back time of solar panels is more than 45 years (although 70 years, he wrote, "is a more realistic figure"). Yet the average life of a photovoltaic cell is only 25 years."
I have written to the quoted sources to see if this can be confirmed and turned into something that the public can use to assess actual £ & e-values to help their decision processes.
I'll let you know if they come back.