Long-tailed tit sitting on a branch

We now have a pair of long-tailed tits which seem to be living in the garden. They appear so often I'm sure they must have a nest close by. We've always had regular visits by small flocks of long-tailed tits but they tended to be intermittent and fleeting. Now these two tits are feeding on both sunflower seeds and suet pellets all day every day.

This one seemed to be stuffed and happily took a few minutes to rest outside my window. I'd love to see their nest as they are reputed to wonderfully designed.