Hi, thanks for the replies. I have opened the nuc this morning, placed some leaves and they appeared to be orientating themselves well.
However when I went back to put the bait box in its original place, from where I caught this swarm, I found a couple of hundred bees in the place where the box was before.
Now I have to remind yous that I moved the box in the morning , with the swarm in it when it was still dark. Could it be that workers sleep away of the hive/nuc then go back the following morning?
As soon as I put the bait box in place, the bees present started moving in, obviously. Now I will try and go the earliest possible next morning and move the workers which I find in the bait box to the Nuc containing the swarm.