Thanks Everyone for you help and answers
Well
I stayed up on cat watch lol but dozed off and woke to such a commotion ran out straight away but nothing and all was quiet, went to where the fledgling was last i saw it, but it wasnt there nor was there any noise in the bird box.
This morning i was up bright and early and went out to see how things were all was quiet, has been quiet all day, although i did see A fledgling with its parent, the blue tits are around but the bird box appears to be quiet and empty!!!
They could have waited to go wen i had my camera at the ready especially after i was up on cat watch LOL.
How long do i leave the box b4 i take it down to clean? I have heard wasps might take over once birds have gone and its the last thing i want being allergic to there sting
Thanks Misty