I had a chat to one of their sales team.
So, for me it would be 14 panels and a battery (Panasonic 8kwh). I've got a flat roof ( 5 deg) and instead of mounting on stands to get the right inclination, they just add another panel.
They are using Enaphase microinverters.
If the power fails, it shuts down, but you have access to a single power point rated so that you can draw 1kw/h only.
They are suggesting a new power company with day and night rates, I think he said 11c/kwh at night, but I'd just stay with Flick at 5c/kwh, and not export anything back to the grid or not worry about the export if any.
And there is an option to purchase the rest of the production so that you don't pay anything thereafter, but they still own the gear and look after it. This might be if you were to sell the house and the buyer did not want to take on the contract.