re the first link for Nazeing, from TC - just had a look through Geoffrey C. Timberlake's booklet "75 Years of diverse Glass-making to the World" - A celebration of Nazeing Glass Works 1928 - 2003 and exploration of their Victorian origins" - since I couldn't recall seeing any pix of milk glass.
Bottom of page 88 - when discussing the various colours used at the factory, it reads ............... "Additionally, white was used as a stand-alone colour, (Colour plate 37) rolled in the Cloudy style. Nazeing did not make any art glass in an opaque white or 'milk' glass colour".
So assume we read it that they did produce milk glass items, but only those which we would interpret as utility - or in this case commemorative pieces. This booklet doesn't show or refer to any milk glass items, whether commemorative or otherwise, so whatever they made might well have been in small quantities only.