Not sure they ever had John. But ...not sure what you mean
a garage has no power at all to stop you driving your car away
And i need to ask my uncle to confirm things, however i seem to remember if it left the garage you had to pay for a retest. Its vague in my memory but i seem to remember things like split brakes hoses you could not drive it legally home. But this is 50 years ago we are talking about.
I will clarify things tommorow....once i have slept on it.
