I'm sorry if I inadvertently broke any of the rules on PPRUNE - I hadn't realised that permission was required to post a poll and wasn't (and remain uncertain) who to ask for permission. If the moderator who pulled the link would like to PM me, I'd be happy to discuss its purpose.
In outline yes, I am interested to see whether people are clustering around particular altitudes or using the airspace more fully. It's just for personal curiosity - I'm not affiliated to an university or any other institution.