I should have been clearer with my wording, I never intended to imply/support a dual roll centre concept. Actually i didn't read retrorally post as implying that either. Funny how we read the same thing but come to different conclusions. I read it to imply that leaf and other lateral restraint can either assist or work against each other. Which I agree with, poorly implemented watts linkage would be worse then without one.

I agree that Toms issues are not caused by a lack of lateral restraint, will be interesting to see what the cause ends up being.
I also agree it is perfectly resonable to race without one, many have with great success.

I think however, without evidence, it's a long bow to draw to say that better control of the diff location wouldn't have made a difference in lap times. Maybe out of the box, just lowering a 1200 hits the rear roll centre sweet spot? If so great, saves a heap of time and money.
I have strugged to find subjective/objective evidence of how much of a difference, if any, a lateral restraint would make. I can't find any for 1200s, but the escort community has talked about it. Page three of this link does have some subjective discussions on watts with leafs. http://www.rsmotorsport.com.au/forums/viewtopic.php?f=25&t=3292&start=40


I like doing experiments and a lateral restraint is something that I would like to do in a future upgrade, but that will be some time off yet and a little down the list of priorities.
Having just installed an adjustable rear swaybar, I would like to do some back to back testing with that first.