http://www.dft.gov.uk/vosa/repository/MoT - Issue 50 - May 2011.pdf

looks like the government wants to stop people playing with ther cars read suspention

remember this question

DEFENDER ANTI-ROLL BARS
I was wondering whether you could help with the following, or put me in touch with someone who can give advice? Some Land Rover Defender drivers remove or disconnect their rear anti-roll bars to help improve rear wheel articulation (indeed, a lot of Defenders don't have them fitted). But we've heard from a reader that the MOT rules are due to change and this would result in a failure. Is this correct? John Pearson, Editor-in-Chief, Land Rover Owner International magazine.

Removing an anti-roll bar which was originally fitted to the vehicle is now a reason for rejection (ie a failure) in the MOT (at 19/10/10) – MOTT.

http://www.motester.co.uk/CarOwnersGuidetoTheMOT/MOTQA.aspx

well my disco went for its mot today and iv removed my arb and he didn't say anything !!!!

From what i understand if they cant see where it used to be then they can not 100% say it had it and thus fail it, same with pre 92 vehicles and CATs and Proper VWs beetles, the baja boys remove their ARBs for the same reason.