For the last couple of weeks, bat droppings have appeared in our porch.  Wasn't sure where they were coming from as no obvious roost hole.  So tonight I waited to see what was happening - about 2 hours after sunset a bat did a few circuits then perched on the wall.  He then climbed up into the corner where he spent the next few hours. 

ID not obvious to me.  Serotine Bat possibly.