We used to have a Seat Mii (same thing) and the transmission is definitely on the r****** side. Very crunchy from cold and the clutch makes a kid of slapping sound every time you change gear. I don't know if a weak transmission is the reason they put such a feeble engine in. Presumably not as there is a GTI model that goes well.

The HJ review data shows that the car in general has a weak clutch/transmission - several early failures reported in the former 'Good & Bad' (now 'What to watch out for' section, and worryingly the problem never appeared to be resolved, given they show reports throughout the lifespan of the model (I suspect there were problems after the last fault report on HJ in 2019, mainly because far fewer owners bother reporting faults here any more (a shame).