On 03/08/2020 21:42, Jim GM4DHJ ... wrote:
why do they say property of then ?

It varies. We had FloGas cylinders, and while they would "refill" them
(by selling you a new full one at a discount) they didn't want them back
for any other reason.

I sold them second hand instead. One was part full. And I am _so_ glad
to see the end of that hob!

Andy