Thanks.
The tank looks like a spare. I thought of ordering a space saver but then discovered the original spare fits in the boot like a glove. I also have a can of Fix-a-flat foam.
The gauges are independent (ECU cannot display LPG economy figures, it thinks it's gasoline), you can see the Prins button which selects the fuel source. The Prins logo is lit when the engine is running on LPG. The intensity of the LED under the button is ambient light sensitive, really nice touch.The button also has its own level indicator, see the arc of squares. The leftmost square turns amber (from normal blue) when there's 50 miles worth of LPG left. Running out it beeps and switches to gasoline.