Here are the first three quartets in Lombardini's Opus 3; full score and parts enclosed.
The music is a little more flowing and melodic than many quartets tend to be; there is a steady pulse provided by the cello and viola but it's not as strongly rhythmic as many classical quartets. So the interplay between the violin parts mix well with the lower strings. And while the music is interesting and challenging, it's not overly difficult for most groups to play.