Enstone operates 600' circuits for microlights and motor gliders and 800' for everyone else. All the circuits are to the North (historically to avoid conflict with Upper Heyford). Although when gliders were operating they used a pattern to the south.
Generally, it works well. The slower traffic uses the tighter pattern and is generally in sight of the higher pattern traffic. The availability of parallel grass and hard runways also helps avoiding a forced go-around if traffic gets too close on final.