Hi Chris
The two Wildflower books that I constantly refer to are: Wild Flowers of Britain and Ireland by Marjorie Blamey, Richard and Alistair Fitter and The Wild Flower Key by Francis Rose.
As you will have noticed there are many pictures that others and I have been unable to identify. Take a field guide when you are out and try to ID at the time you take the photos of any flowers. Always easier to tell what they are from the living plant than from a picture. Many of your pictures have several types of flowers, try to ID each separately even if it means keeping a notebook for the purpose. Giving type of habitat when you post is always a help for others to confirm your ID
But above all keep trying even if you get it wrong it is surprising how quickly you will learn to ID plants that you see, and KEEP POSTING YOUR PICTURES, they are great even without identity. Also it keeps the likes of me on our toes.
Regards
Wildone