Remarkably, I've just had a visit from one of their reps. Coincidentally on the day that I finally connected my PV system to the grid.
She thought I'd been conned because I'd installed them myself for 6k. When I pressed her, she confidently claimed that their company was installing these systems for £500 and that this because of a government grant. When I pointed out that there was no government grant and FITs had replaced these, she was adamant. Incredibly, despite the fact that I clearly knew what I was talking about, she stuck to her guns. I was wrong, she was right.
This is a balls out con and something should be done about it. They must be doing a lot of this canvassing and it is hugely damaging to the image of the industry.