The author (creator) of a book or script holds automatic copyright in the UK. If you wrote it, then the copyright belongs to you. Copyright can be inherited through a Contract that is signed denoting transfer of copyright. The Writers’ Guild of Great Britain explains copyright here. There is a good explanation of UK copyright law on Wikipedia.
I receive many submissions and similarities of subject matter can happen. No idea is truly unique.  I develop my own books and scripts alongside my development work as a writing consultant, ghostwriter and scriptwriter. Any similarity to any material sent to me is entirely coincidental. I can’t therefore undertake to compensate you if material similar to yours (directly submitted to me or received coincidentally from another source), is subsequently commissioned or produced.