My Cherry tree

Are the bluetits looking for insects on the blossom? They have made a mess of my viburnum bodnantense. An odd thing has happened - a viburnum - not bodnantense - that I'd given up on has produced blossom for the first time in about nine years, though only at the very top. It's pretty straggly, so will get a good pruning when it stops flowering. A lot is happening - plenty of hellebores, of various colours and sizes and I don't know where they all come from; presumably they are spread in bird excrement as most of them are growing close to the fence where the birds perch!