There are to be some changes to the MOT test from 1st January 2012 which are being introduced in response to European Commission Directive 2010/48/EU of the 5th July 2010
4.1.4 Compliance with requirements:
(a) Lamp, emitted colour, position or intensity not in accordance with the requirements
(b) Products on lens or light source which obviously reduce light intensity or change emitted colour
(c) Light source and lamp not compatible
4.1.5. Levelling devices (where mandatory):
(a) Device not operating.
(b) Manual device cannot be operated from driverís seat.
4.1.6 Headlamp cleaning device (where mandatory):
Device not operating.
For anyone with a diesel / petrol remap, section 6.1.9 may be relevant.
6.1.9 Engine performance:
(a) Control unit illegal modified.
(b) Illegal engine modification.
There will also be a new check on the general condition of the wiring:
4.11. Electrical wiring
(a) Wiring insecure or not adequately secured.
(b) Wiring deteriorated.
(c) Damaged or deteriorated insulation
and on the function of airbag and seat belt pre-tensioner systems:
7.1.4. Safety belt Pre-tensioners:
Pre-tensioner obviously missing or not suitable with the vehicle.
(a) Airbags obviously missing or not suitable with the vehicle.
(b) Airbag obviously non-operative.
7.1.6. SRS Systems:
SRS MIL indicates any kind of failure of the system.
So you have just over a year to sort it out.
Now start chatting about chips and remaps