I don’t think the records for Bitton are available on any website for the date, your after.
So you could order in at the LDS link: but you would need to visit your local LDS family history centre
Link to order record.
But I do wonder if the years you need exist at all!
also there are some great websites you should check out
this is one for Bitton (has parish registers but not what your after?)
and this chap is into Ballard research, and has been looking at the Ballards in Bitton.
Why not give him an email.
Hope this helps