Guardian: With the government offering to pay you – and some companies even offering to fit them for free – you may be considering installing solar photovoltaic panels on your roof. But if you are, would you really want to buy one from a company that’s been responsible for one of the biggest recent environmental cock-ups on the planet or one that’s up to its neck in the arms trade? No of course you wouldn’t. To help shoppers navigate this particular ethical-minefield in its latest buyers’ …