Tits in a Box

What a lovely morning it was to sit out side and watch my resident Great Tits fly around. I did think at first they had given up on my bird box until another bird perched close to it, they soon scared him off. Then it was back to fighting his reflection and flying back ond fore.
I wonder how long before they lay eggs and for them to hatch. Would love to take pics of the little fledglings.

Did take some other early 'ish Sunday morning pics please take a look.