As a followup to the above, try simply Christ Hospital an Google Images.
Out of 28 pages only the first eight are worth checking (the rest are principally different places or copies of stuff in the first pages or I have given details below).
The first picture I checked was the uniform posted as an advert by the Yorkshire company which makes the "houseycoats, breeches and shirts" for CH. Another is a "Commended" site for a lighting trade award - CH Chapel.
There is a mass of stuff there including Michael Wilding (film star) in CH uniform at age 8.
Perhaps some more recent pupil can tell us all what the picture of and reference to housey is on
domovoy.ru/pril/art7.html
It's a Russian site, written in Russian except for the school name and address.
Mid B grecians of 1997 feature heavily (including St Matthews Day parade and a few booze ups by the look of it) on a site appearing to belong to someone called Edwin (aka Bones) Dalston:
http://meltingpot.fortunecity.com/dalst ... tures.html
A pretty good photo of CH Hertford probably taken as the girls left on
http://www.hertford.net/gallery/hert001 ... D%26sa%3DN
Is there a John Shippen around? Your pictures are on
gallery.shippen.org.uk/latestpix (those of HM's visit are well worth seeing - congrats).
I got the link from Christian Ashby (gallery.cashby.me.uk/) who also has a lot of 1992 onwards photos involving CH scouts in Austria, Romania and Welsford. His involvement in CH drama / music detailed on his home page)