While Honda's hybrid technology is mainly good (but rubbish when the weather turns cold),
I disagree that its rubbish in winter. . MPG is very good compared to most conventional petrol ICE cars in summer. It may loose much of its mpg advantage and frequency of silent EV mode in winter or when driven at high speeds or enthusiastically but mpg and noise levels are still usually at least a good as, or better than most conventional ICE cars of similar size. And retains the advantage of effortless automatic transmission.
Full EV's have a significant reduction in their sometimes already meagre claimed range in cold weather , due to battery performance or if the battery has to power heating, air conditioning ,high speeds , extra lights etc. It may still meet your needs better.
My dealer mentioned they rely on the jazz as their best seller , helped by some sales through Motability .
Their advertised used car stock is currently 12 Jazz( inc crosstar) (was 15) and 13 CR-V's , and just 4 cars that are other honda models (mostly 2024 cars, possibly ex demonstrators)
Bigger cars dont cost much more to build ,transport etc than small ones - They just leave a bit more empty space between the wheels . So more scope for discounts.
If Honda have only imported a comparatively few Chinese made EV's into the UK they may prefer to sit on them until buyers come along rather than dump them at a lower price than other cars they hope to sell.