Join Date: Feb 2007
Nominated 16 Times in 67 Posts
TOTW/F/M Award(s): 28
Thanked 5,200 Times in 4,712 Posts
Personally I can't see how carrying out an MOT examination could cause light failure.
See the link below for likely prices for a ballast although you may find something cheaper on god old fleabay.
Bur as already siad it would be best to check exactly what is faulty first
Currently in madnoel10's garage:
Honda Civic 1.4l