The Longueville panels...

It has now been established that the circular window installed in place of the "louvre ventilator"is still in the building (due for restoration later in the project). This is the 5 ft diameter panel purchased for 10 pound from St Andrew's, Longueville, in June 1929.

I have now tracked down "St Andrew's Presbyterian Church, Longueville: silver jubilee celebrations 1911-1936", a publication held on microform by the National Library. At this stage I haven't established how to get my hands on said publication short of a visit to Canberra - which I've just done twice in the space of a month and probably wont be doing again any time soon so here's hoping technology is going to pull through for me!

Assuming that this panel was built for this parish, which is fair given that it carries its insignia (St Andrew's cross) we can now pretty safely say the panel is no older than 1911. Possibly almost 100 years old. Not ancient in terms of stained glass, but up there with the significantly aged in Sydney.