Hi All,
I finally got around to putting an Air2 on my BCD. I bought it in Flagship - they don't sell them but had one which was new when taken off an Oceanic BCD - 25 euro

( mind it cost a further 50 to get a hose

).
Gave it a go last Sunday and it breaths fine. The mouthpiece was a bit rudimentary so I took one off an old snorkel and much more comfortable and secure in the mouth now.
This allowed me to take my octopus away meaning I have one less dangly bit on the dive.
So now I have my main reg ( on a 48" hose ) or Air2 to donate and my pony reg slung under my chin should the main kit pack it in. I need to do a few more dives with this configuration to see if it suits but signs on it it's just the ticket for me.
Cheers
Chris