WCA error rate is ok says Matthew Sinclair

I have just listened to Matthew Sinclair of the Taxpayers’ Alliance extolling the virtues of the WCA and accepting a 30+% error rate on the basis that it will slowly get better and there is after all an appeals procedure albeit there is a long queue.

I wonder if he would so readily accept the same misclassification rate with the same open-ended commitment to improvement and a long appeal process for car MOTs. 

The analogy would be that 30% of cars on the road had failed the MoT and the driver had appealed the decision, but would not know the outcome for another 9 months. 

I think the MoT test would instantly be written off as useless.