Thanks everyone for the thoughts. Hadn't really thought about the AL80/bottom stages but it does sound like it would make things logistically easier to use those. Haven't done the mixing course yet Tricky but will probably do it with Mark Powell when I contact him.
A revised plan then: 2 twinsets of 18.45 each with 4 AL80 with 18.45 should give 4 dives per person, 1 twinset of 32% and then 1 AL80 of 50% to start with. (Don't want to crash the van then with that amount of money onboard!)
The O2 tops/fills will be done by the skipper rather than piss him off.
Looks like 15 twinsets, 25 AL80s, at least 2 scooters, and all the rest of the gear: that should easily fit into the back of a transit
Is everyone busy in the first week in September or might you be able to lend some AL80s
