No problem using steel at all.
Off hand I don't know of any up your way, but here in the states FE's have to be inspected, and re certified frequently (yearly?), and there is usually a tag, hanging on them saying who the FE company is and when inspected etc. I would guess its similar up your way. Just look on a FE at work, or in some other public building.
Steel bottles here have to be inspected every 5 or 10 years, but last forever. Aluminum have to be inspected as well.