In the sunken stream running from the colony reservoir just before it reaches the walls of the house grounds on the edge of the water i found the following.
Specifically the plants with fleshy looking curled leaves that rise above the others and look like a flower in shape and may be unfurling and not in their final state
It's hard to judge scale but it looks rather like a Plagiothecium moss...
hmmm . . not sure. If its very wet, the rosettes may be the early leaves of water mint?
thanks for replies
was up there the following weekend but water level was down and no further growth so will have to check again in a couple of weeks