Apparently from March 2012 :-
The main changes
Electronic parking brake
Electronic parking brake controls are now included and must be present and not inappropriately repaired or modified - repair obviously likely to adversely affect the roadworthiness of the vehicle or modification that has seriously weakened the component.
(The 'inappropriately repaired or modified' check is to be applied to a wide range of systems and components throughout the vehicle.)
The car will fail if an Electronic Parking Brake warning lamp is illuminated to indicate a malfunction.
Electronic Stability Control
Checks of antilock brakes will be extended to include Electronic Stability Control if fitted. The tester will check for the presence and correct operation of the ESC malfunction warning light together with looking for obviously missing, excessively damaged or inappropriately repaired or modified components and electrical wiring, as well as an ESC switch missing, insecure or faulty.
Warning lights
As well as electronic parking brake and electronic stability control warning lights (where fitted) the MOT test will also include checks for the correct function of the following, where fitted;
Headlight main beam warning light
Electronic power steering warning light
Brake fluid level warning light
Seat belt pre-tensioner warning light