Hi Leni. Whitefriars did do commercial stained glass for hospitals, schools , and other businesses, so it would not be out of the question for them to have done designs for normal domestic buildings, especially if the houses were part of an "estate". The Museum of London has over 3,200 designs by W/F apparantly so it may be worth your while sending them your photo to see if they can through any light on it (no pun intended!)
Sue, sorry those two place names are not listed. Cheers Emmi