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Maybe depends on MOT had a motorbiked engined kit car that didn't fail for no reverse gear.
Is the gearbox a non sycro first/reverse, if I remember the age of your should be a non snycro first, check the plastic bushes haven't worn out in the change mechanism in the floor it is usually that especially if the gearchange is vague. Will search for an image..
Check gearbox oil level, and if been filled with the right non ep gearoil not gl4 and especially not gl5. If it has had GL4/5 oil in the gearbox it is is most likely fucked requiring at least sycro bearings and brone bushing replaced and will be very expensive to rebuild even at home. In the early 90s if a gearbox failed and the oil smelt of ep additives when drained. Didn't even bother to open the gearbox to check just swapped the gearbox at a breakers.
Reverse gear in the little fiat has gone awol.
Will this fail the mot it is booked in for on weds? Will call my garage in morning but apart from hassle of not going backwards is it even an MOT issue