Long Tail Tit in hiding (peek a boo)

I was out on my Tuesday hike with my Grandson to the local moat.It was grey,it was cold.But nature was about it's work with birds making their nests and performing their courting rituals!
There were a pair of LTT flitting back and forth with what I later discovered was Duck down.Obviously lining their nest.
On a brighter day I will return and knowing where they are I will set up my camera on a tripod and hope for better results?