Its a Black Tern, and a Willow Warbler. Yes a Tree Pipit and Marsh Harrier. Don't know enough about African Accipiters
Edit: That tern... the rump does look whitish and the bill small, but I'm seeing a peg!
Yes they are Tree Pipits, the plover looked different to other Grey Plovers because its late into its moult. Your last Warbler is going to be a challenge to ID conclusively. MIght be Eastern Olivaceous Warbler...might not.