from the pix I can find, this lady seems to have been responsible for the 'Intimates' range produced by Dartington around 1997/98 - which were produced in clear crystal, and cased shades of blue, green and lavender - BUT Hornsey's shapes seem to have been only the convex and concave bulbousy sort of things (Scandi looking) - not plain ones like yours. So, this one may well not be from Belinda Hornsey - and possibly one of the other designers.