This is all very curious.
The Vales children were not born in Devon - births are supposed to be registered in the district in which they occur. Baptisms can take place elsewhere. There is a birth registration entries for Mary Vale in West Derby RD June qtr 1853 vol 8b 364.
The official GRO indexes give the mother's maiden name for this entry as Murphy.
There is no birth registration for Benjamin Vale with the same mms, but there is one for a William Vale in 1865, Liverpool RD Dec qtr vol 8b p 242
William Vale married Ann Murphy in Sept qtr 1852 vol 8b p 259 (from GRO index). From Lancashire BMD the marriage took place at Our Lady St. Nicholas & St. Anne, Liverpool. The original register entry says the following:
11th July 1852
William Vale of full age bachelor black smith of Lambert Street, father Thomas Vale, labourer
Mary Murphy minor spinster of St Vincent Street, father Peter Murphy labourer,
by banns
William & Mary both made their mark
Witneses: George Evans (signed) & Sarah Evans (made her mark)
p 115 entry 229
So there is a birth registration for a daughter of William Vale and his wife Ann ( who might have been Mary Ann, but definitely not the Lydia Jane Hartley as in reply no 17 from OP - I'm still wondering where that came from).
These people are living at the same address at John Tollerfield and his wife Pauline in 1891, although no relationships are shown. In 1881 it is just Mary A Vale.
The implication is that Pauline is the daughter of Mary A Vale and therefore William, although she only acquires the name Pauline at baptism.
The first child John has the mms Vale in 1876 and he can be found in the household in 1881.
The second child Pauline in 1879 has mms Lethbridge, as does Margaret Jane in 1881, Charles in 1887 etc It seems a fair conclusion that Pauline decided to use the mms Lethbridge after John's birth. And that is also the name under which she married in 1873 - see the marriage entry. As I said before no mention of William Vale at all.
One wonders why she did that.
Anyway, since my question about whether you are still interested in Tollerfields in Alverstoke remains unanswered, I shall leave this query now.
Good luck.
Nell
Added: I agree with Mckha, th 'A' probably indicated adult or older child baptisms