The 2 children are:

Ann dau of William & Cindonia Byett baptised at Blakeney on 13 July 1823 &

William son of William & Cindonia Byett baptised at Blakeney on 17 Oct 1824

I can`t see any baptism of a John with father William in 1824

Hi Graham,
Baptism of John was at Awre in 1824. I didnt know about the ones you have mentioned. Will add them in and do some more research. The different spelling of the name Sidney is a massive help too, thank you :)