We are playing the Walton Viola Concerto this week in the VSO, and there is an extensive harp part! On previous occasions when we have done it, there was none. In fact, in the orchestration list provided in our schedules, the harp was not part of it. So, heads up, in case you see it in an upcoming program. You may get a surprise!
This edition is published by the Oxford University Press. I found the font a bit small and faint, so I had to enlarge my part and darken some notes.