Gas it kit..

No problem got me into the garden to do the photo!!    The cover is obviously on the fill point. There is a gap where the hoses cross but I have this thing about hoses rubbing so the sponge is there just in case.  When hoses ready for replacement will get some SS Braided made up
The plastic thing on the side of the cylinder (£1.48) is the most reliable device I have found for lpg levels and thats including the ultrasonic stuff.

This locker is on the offside, there is room for a bbq point in there as well but we are not into gas bbq's    I am not that tidy by the way its just I took the water containers out for the photo they fill the space where another 11/13kg cylinder could go.

We havn't been challenged yet over filling and have used garages and lpg distributors over this set up

I like your security bracket on the floor!  I am guessing there is another behind the bottle of "pink". 
Incidentally, I am now totally converted to bio laundry liquid which I put into the loo flush tank. Judy reckons that it keeps the pan much cleaner and the smell is more pleasant than Elsanol.
PS Just spotted the extra on on the left so perhaps there are four brackets - belt and braces then!

Yes there is another home made clamp at the base of the cylinder. I agree over the bio ll but the ones we have tried management doesnt like the smell of so it sticks to blue or green
The pink is topped up from a larger containerr in the garage