You could try David Dew Funeral Services in Masterton - they handled Flora's funeral and will have the contact details for any relatives.
Otherwise check out Flora's newspaper death notice (the post before the one about locating the ashes/photo albums) - there's an address on that. Checking the white pages online there is an entry for that surname at the same Martinborough RD address. May be the same person.
Thank goodness the gentleman had the presence of mind to spot this stuff and do something about it.