Hi David, thank you for the welcome and your recommendation.
I had a feeling 25L would be a bit too large so what you advise makes a lot of sense.
Believe it or not Gum Tree was where I found the 9.8, it had been online for about two hours and I was first to contact the seller, when I collected he said the phone had not stopped ringing about the add. I was very lucky to get hold of one as I know how desirable these are, especially a mint unit.
Have a good weekend