As far as I know, you only need to have the IVA test to register & tax the car.
I believe that most local MOT stations will let you have the use of their rolling road to help you to set up your brakes prior to the IVA
The costs should not be too great, i guess it will depend on how well you know your local testing station.
You may need to provide some general axle weights to allow the rolling road operator to calculate the correct brake effort & balance.
This way, at least you know your brakes will be OK for the IVA test.
