Many thanks to all who have replied - much better response than I'd anticipated and thanks to Paul for the photos, great for comparison and all the info. Thanks too for the welcomes.
To clarify, the top has definitely been ground flat on the top surface and then the outer and inner edges ground at an angle to achieve the bevels - I suppose they were trying to achieve a rounded effect. The bowl length, from bottom of the lowest lens is 11.6cm while the 6.2cm diameter.
Without knowing much about glass, I would say that logic would dictate this not being a celery vase. Victorian society seems to have been concerned with obvious shows of affluence, the bigger the better. A display of four sticks - the approx. capacity of this glass - wouldn't have impressed anyone! I suppose it might have been suitable for a budget conscious household, though.
To go off topic slightly (apologies) could anyone please direct me to any glossary of terms for cuts of glass - lenses, punties, printies, flute cut, petal cut, slice cut, etc., etc.?