If anyone is interested in installing a clean copy of Lenovo's ICS on their A1, gmarkhall has posted instructions and downloads on Lenovo's forum.
The process creates a bootable microSD. You boot from it twice, installing three different files it has loaded on the microSD. When done, you have a clean A107I0_A404_001_013_0116_US version of ICS on your tablet.
http://forums.lenovo.com/t5/IdeaPad-IdeaTab-Slate-Tablets/GUIDE-A1-and-A1107-Unbrick-fix-full-factory-restore/td-p/841373
Great job Graham!
I installed ICS 4.04 followed the steps on this page
http://forums.lenovo.com/t5/IdeaPad...-Unbrick-fix-full-factory-restore/ta-p/841499
http://forums.lenovo.com/t5/IdeaPad...-Unbrick-fix-full-factory-restore/ta-p/841499
And then rooted by A1 rooter
It works perfectly