Duck identification Loch Leven

I took the following 5 photos today at Loch Leven. All were at a distance so the quality isn't great. Any help would be greatly appreciated!

I thought the following: photo 1: Shoveler 2. female Pochards 3. another female Pochard 4. Gadwall 5. another Gadwall?
I may be wrong on all 5 photos but as my son is trying to 'bag' some new species it would be nice to get the identification correct rather than from my uneducated/inexperienced eye!