Siciliana in D minor

Born in Oxford, William Walond served there as assistant organist and copyist at New College and Christ Church Cathedral. He was succeeded at his death by his son, who was christened William after his father. Walond composed a collection of organ voluntaries.
(source: Naxos Music Library)

This Siciliana is part of one of those voluntaries. I couldn't find the complete voluntary anywhere (probably didn't search well enough). So if you know the complete piece, let me know.