Not our Blue Tit

When I first started blipping back in March, I blipped our birdbox. The blue tits did settle in our box and can very occassionaly be seen tooing and frowing.I dont know if we have any babies yet though. I dont think they are the same pair we had previously as these two are quite elusive and hardly come out if they know we are about. I often have my camera at the ready in the kitchen, but they never linger long on their doorstep.
This one was caught whilst out walking this morning, but its not our blue tit.