Thanks Goggy & Helen. Helen, many thanks for contacting that GR member, fingers crossed

Well, as I said, I had no intention of making this a Rootschat challenge, but the lure of the chase proved too much for me & I was off rummaging through the internet

This is what I've found;
IGI - Samuel Wallop bap. 25/6/1815, Chippenham, Wilts. S/o James & Sophia.
Possibly her father baptised as an 8 year old? Married (1) Sarah Broom 5/5/1834 Castle Combe.
1851 at Pig Hill Castle Combe HO107/1836/53/12
Samuel Wallop 42 tailor & drappers appren. born Castle Combe
Susanna 42 born Bath
Mary 15 born Castle Combe
Hannah 13 dittoEliza Ann 10 ditto
1861 - still at Pig Hill (forgot ref)
Samuel tailor & collector of taxes
Susanna
Eliza Ann 18 unm pupil teacher
I found Hannah in 1861 by putting in her details but no surname and found,
1861 - Brightling Sussex (forgot ref again

) Brightling St, School House
William Briely 23 school master born Bath Somerset
Hannah Briely 23 school mistress born Castle Combe
Marriage found courtesy of Allan on the Wiltshire board,
September quarter 1860, BREYLEY, Chippenham (5a 69)
Went back to 1851 HO107/1836/51/9 Castle Combe
John Breley 48 police officer born Devon
Catherine 48
William Breley 13 born Bath SomersetElizabeth 11 ditto
So, if Hannah went to NZ it was in the name of BRELEY and after census night (7/4/1861) but before census night 2/4/1871 as I can't find them there 'nor in 1881.
I've tried a few sites for NZ immigrants but they're normally indexed ship by ship so quite a task!
Any brilliant ideas warmly welcomed

Jane