I realised that Mad Mike has already suggested creeping buttercup for number 8, which is correct.
1. Southern marsh orchid
2. Early Purple orchid
3. Twayblade
4.
5. Common spotted orchid
6. Dandelion
7. Ribwort plantain, yes
8. Creeping Buttercup
9. Cow parsley
10. Bugle
11. Hawthorn
12. Herb Robert
13. Red campion
14. Marsh Lousewort
15. Marsh Marigold
16. Meadow Buttercup
17. Brooklime
18.
19. Cowslip
20.
21. Bird's Foot Trefoil
22. Blue bell
23. Red clover
24. Ragged robin
1. Southern marsh orchid
2. Early Purple orchid
3. Twayblade
4.
5. Common spotted orchid
6. Dandelion
7. Ribwort plantain, yes
8. Creeping Buttercup
9. Cow parsley
10. Bugle
11. Hawthorn
12. Herb Robert
13. Red campion
14. Marsh Lousewort
15. Marsh Marigold
16. Meadow Buttercup
17. Brooklime
18.
19. Cowslip
20.
21. Bird's Foot Trefoil
22. Blue bell
23. Red clover
24. Ragged robin