In need of ID help!

Hello,

I visited Rainham for the first time this Saturday. I'm an amateur bird watcher, so wasn't always sure what I was looking at. Please could someone help me work out what the birds I photographed are?

Thanks in advance

1. Possibly a redshank due to reddish legs, and tail seems wider than spotted redshank's
   1.  
2. Is this a marsh harrier?
   1.  
   2. 
   3. 
   5. 
3. not sure if a reed warbler or a whitethroat? or neither?
   1.