OK folks, here's my report and findings.
<my setup>
First off, regardless of what any info says about it , this stuff just won't accept solder. It doesn't melt mind you, but I had the tip on the first attempted join for about a minute and only the normal wire would soak it up.
Tying it was the solution , but I found a standered double granny wasn't good enough as the thread's got a bit of spring and has a tendancy to undo itself.
Here's how I ended up connecting thread to wire :thumbsup
First strip a decent length of sleaving from the connector wire and make a hoop (tack solder the tip of the wire to the base so it doesn't open up while tying).
Then pass the thread through the wire hoop and tie it off. I simply went with an extra twist through the thread hoop (almost a half blood knot)
Once pulled tight, it stays there (which is all that matters at this point)
I then closed the wire hoop, added a touch of liquid flux and gave it a generous amont of solder
I used some wire to trace the thread through some heat shrink tubing and tied up the last two connections. After hooking everything up, I turned it on and........TA DA...
Unfortunately there's no pic of the large EL panel as somewhere between unplugging it from the kitchen and plugging it in the shed where it's sufficiently dark, either my inverter died, or my 12v power supply
Luckily I had a 9v pack I'd made for the wife's costume on hand, but only had a bit of reject tape left to take pics of, but the principle is the same.
The reject EL tape actually started smoking a few moments after taking the pic. The reason? It wasn't sealed properly and had absorbed moisture from the atmosphere over time highliting the necessity to "ALWAYS seal your tape, sheet or wire after you've made your cuts!"
Conclusion:
While soldering is OK, its not very elegant, and somewhat fiddly (I got myself in a right tangle for a minute or two, but managed to sort it out). Luckily, the conductive thread is more than happy to soak up wire glue so will be going that route in future as I can get very low profile connections that way.