Well, the result was a good one. The characters look like those in Wallace & Gromit and they talk like them too. The plot was simple. The scenes stealing. And the music interludes were a bunch of gems. I don't think it was as good as their previous ones but as an animated feature it put many others to shame.
The plot revolves around the traditional English one -- mouse from the upper-class gets literally flushed into the underworld only to meet real people, I mean, mice, and learn that it is perhaps better to have nice company than nice things. In so doing, he ironically needs to battle an enemy who has never learnt that lesson. All this with interesting characters and also with the same economy of other Aardman movies. The scenes are not too busy and so they are happy to focus on one or two characters at a time. Moreover, all musical accompaniment comes from a bunch of cute slugs who serenade that characters at appropriate intervals. I can highly recommend this one for children of all ages.