But browsing the net today I found a clever and speedy way to unpick a quilt in hours rather than weeks using a ROTARY CUTTER...
Turn the quilt over to the back and lay it on a large flat surface. Take a blunt rotary cutter (one that you keep for paper cutting etc) and angle it down towards the batting. At the same time pull the backing away from the batting to reveal the stitches. Press the rotary cutter down onto the stitches and into the batting, making sure not to cut the the backing fabric. Keep pulling the backing back as you cut the stitches. Work across the whole of the quilt rather than one line of stitches. It's like taking the skin off a fish!
I did the whole quilt in just over an hour and removed the little threads from the top using a piece of masking tape.
This must be the quilting tip of the year!