SATB with Piano SSA with Piano TTBB with Piano Soloist, SSA with Piano Soloist, SATB and Treble Choir with Piano (The Community Version)
Each of these has an orchestral arrangement available and there are also arrangements for String Quartet Brass Ensemble Organ (with optional Trumpet Harp
All the above available as printed scores or as downloads
The Christmas Symphony is the original version featured in the above video of the complete TV broadcast from Ely Cathedral