PS - I have missed Christchurch 1st station - 1862 to 1886 - which I now think I should have included as the first station was a similar distance from the current one as at Bournemouth. Mea Cupola! (Never could do Latin).
INFORMATION
That 1862-1886 station in Christchurch you describe above was not a station on the line we had been traversing, but was one of the three stations on the Ringwood, Christchurch and Bournemouth Railway, the other two stations on that line being those of Avon Lodge and of Hurn.
Therefore, it cannot be used as a posting submission on the line we were traversing.
Shillingstone
Stourpaine & Durweston Halt
Not so. Please refer to Rule 3, where both Shillingstone and Midsomer Norton on this particular line we are traversing are shown amongst the examples of "Heritage railway facilities".