Great Spotted... spotted

So I heard the usual tapping in the garden. I stepped onto the balcony to peer into the trees and there it was. But no, it was not him (or her), not my Syrian. Rather, it was a male Great Spotted Woodpecker. Four things: 1) You can't take anything for granted. 2) There is no difference in tapping (as in feeding action) between these species. 3) There are differences in drumming. 4) Both these species live side by side, share the same areas, habitats, they overlap... though some of the literature denies this... incorrectly.