Some details I've compiled on the late Mrs Hare's parents:
I searched for her birth record to no avail, but came across sources which led me to conclude her father was Frank Wevill Gordon North (1896-1950), who was a mining engineer, in China and elsewhere. His probate record named 'Gladys May North' and 'Jean Marion Gordon', 'widows'; another source (which gives 'Weevil' rather than 'Wevill'- at odds with all the Gazette and mining journal records I could find) gave him as marrying Gladys May Peabody (1894-1990) in 1917, and having three children: Joan Marion, Jill Peggotty, and Jeremy Gordon Mathews. Given these details I think this is correct- I found a 1917 marriage record at Hollingbourne, Kent for a Gladys 'Paybody' and Frank 'N.' G. North, which would seem to be the right one- but couldn't find a birth record for Mrs Hare. There was however a 1920 birth record for Joan M. North, mother Paybody (which is, therefore, having appeared twice in official records, probably the correct spelling). The obituary in 'The Mining Journal' states that he: 'was at the Royal School of Mines from 1912 to 1914 and again, following service with the Forces, from 1918 to 1920.' Another source gives him as resident at Tientsin (now Tianjin), North China in 1921. Possibly Jean Peggotty North was born there.
Burke's 2003 gives F. W. G. North's address as Whipples, Moss Lane, Pinner; his probate record gives Russell Grove, NW7 (Mill Hill), which need of course not be mutually exclusive given the several years between his daughter's marriage and his death. This doesn't seem to preclude 'Frank William Gordon North' (for whom I couldn't find any evidence at all) and 'Frank Wevill Gordon North' (for whom many sources exist) being the same person.
Apparently F. W. G. North was son of Edwin Gordon Niven North (1868-1908), a chemist (including at a laboratory in London as a young man) later resident in Spain, as a mining engineer/ chemist/ official (transferred to this line of work as '2nd class assistant in laboratory'. and ended up as 'chief of sulphate'- I don't really know what these mean in this context, to be honest) who died at Siberia whilst working at the Spassky Copper Mine, having fallen into a furnace attempting to save a colleague. His son was sent to be educated at Clifton whilst E. G. N. North was abroad.
E. G. N. North was son of Charles Niven McIntyre North (1838-1899), a London architect and author on the subject, Freeman of the City of London, son of Charles North (upon whom the site in question is based-
http://www.charles-north.com), a cabinet-maker who later became a successful house builder and estate agent.