The original is in F major. Modern editions often transpose it up a minor 3rd on the mistaken assumption (based on a mis-analysis of the evidence of early organ pipe lengths) that Tudor church was was almost a minor third higher than a'=440. In fact (see Johnstone in Early Music 2003) such evid...
That was fantastic. Are you double pedalling? It sounds as if you use a 'left foot stomp' technique for the bass notes and play a sustained tenor line with your right foot.
Once question; why is the passage 'good claret is my.....' sung one scale degree higher than notated on the score?