All of these were found in marshy areas around the New Forest (the last two were in a town nearby).
The first one is just like a garden Lobelia but I did not expect to find it in the middle of the New Forest.

Not sure if these are both the same species.

Greater Bird's-foot trefoil?

A type of St. John's Wort? Never seen one grow across the ground like this one before.

Speedwell

Bedstraw

Mint family?

And this one has been bugging me for ages, never been able to put a name to it, but I think it must be related to Wood-Sorrel. (This one had 6 petals)

Similar to fennel
Apologies for the amount I've thrown out here, I really need to learn some common plants a bit better!