Thanks Steve.
I shot wider tonight (18mm), and I think you can safely say the tail is at least 37 degrees long, possibly out to 45-46 degrees, and if it persisted after that it's lost in the bright Milky Way starfield. Tonight the tail was going right over Canopus. Visually I couldn't see anything of the tail.
http://i727.photobucket.com/albums/w...taillength.jpg
At 55mm the tail extends faintly out of the bottom-left corner of my frame, a length of 20 degrees:
http://i727.photobucket.com/albums/w...length55mm.jpg
My gear isn't really suited to this stuff - a basic, old entry-level DSLR with cheap lenses, on a rickety unmotorised EQ1 mount and 'guiding' through a reticle with the slo-mo knob. It would be great if someone could repeat this with a halfway decent imaging rig - waiting on Lester, hopefully he's done the business again!
Cheers -