Got mine filled by D+D today.
These are very helpull people. The guy there opened up the bottle and we had a peep inside and it's beautifull and shiny new!
We debated taking out the tube and decided to leave it in. Seems you get better delivery of gas with the tube. Without it you get a frozen lump at the bottom which is probably not good.
Anyway I'm happy and confident.
By the way I still have a couple of spare bottles if anyone has anything interesting to swap.
Chris.