Simon,
There is a link on the Hampshire Resources - Hampshire Parish Registers topic (
http://www.rootschat.com/forum/index.php?topic=435600.0) to Kingsclere parish registers -
http://www.weekehistory.co.uk/kingsclere.htmHaving checked the baptisms, Joseph does not appear to be recorded there. So you may have to widen the search, perhaps to include parishes in Berkshire. I have found another Joseph Miles baptised in 1715, but in the parish of Bramshaw in the New Forest. Perhaps too far away.

A Joseph Miles of Sidmonton was buried in Kingsclere in 1774, but before that the last Miles burial was in the previous century.
John & Ann in Basingstoke also appear to have had the following children: Ann, Mary, John, William, ELizabeth and Jane. Sadly all the names are relatively common.
Nell