Domestication and Travelling Abroad

Hiya, I want to know if a Blue Tit chick was found, hand reared and domesticated (not domesticated on purpose). Not wanting to get rid as doubt it would survive in the wild and it doesn't want to leave when left outside.

Firstly, do I need any licence etc to keep a 'wild' bird in England?

Secondly, if moving abroad and wanting to take the bird, what would I need to do?

Thanks in advance.