Calibre is better installed by its own method as outlined on its site. Any apt repositories are unofficial and likely to be behind current.

When you let anyone make a “TV channel” even when they don’t have a legal team.

To create pressure for a deal to be signed.

Not sure I follow their sums on this. The poorest families aren’t living in the buildings with large roof spaces. So whatever the average saving from having solar fitted, they won’t ever approach anywhere near that, if anything. Who gets the savings from blocks of flats? Presumably the council would take the profit from panels on their properties to prop up their failing budgets. Housing associations are also being squeezed.