Following the above post, here's some pics of a new plant. Note the limp lower leaves (show no sign of discolouration/necrosis) and the necrosis starting around the viens on the upper leaves. Any suggestions anyone? My next try was going to be up the ferts/Mg or try Fe. There's not a lot I can do about the airflow, but I'll make sure she's watered properly from now on (per OT1's schedule on UK420 ;-))
(Pics to follow in next reply- having trouble right now!)