This is a young pipistrelle, found in my daughter's bedroom last night. Bats can't take off from the ground, they need to drop a small distance and then fly. Interestingly, as my husband discovered, once they are off the floor they don't need much height to fly at all. This one took off at about an inch off the ground, but fortunately flew out of the window and into the night without too much cajoling.
Isn't he beautiful?