The little Blue Tits are using the nest boxes to shelter in over winter.   In a brief glimpse of the sun today this little one was backwards and forwards from the nest box to the feeders.    I shall have to get my timing right in clearing the box out in readiness for nest building.    From looking at the opening it looks like they might have taken some leaves in for warmth, and who can blame them poor little things.
It looks like he's wearing matching breeches and waistcoat !!.