Hello,
Nothing about this vase recommends it as eminating from the Nazeing factory. Certainly it bears no relation to any known, or deduced pieces from that source.
None of the following features are recorded as being Nazeing; the laying in of the colour; the 'celery' ribbed handles; the style of bubbling; nor the shape.
Other companies that Elwell bought from included, Thomas Webb, Gray-stan, Stevens & Williams and Whitefriars, as well as Czechoslovakian factories (see Hajdamach 2009, page 105). The latter would be where I would be looking, given the style of this vase - although another company, that has very little information published about it could conceivably be Arculus (Birmingham). Whether or not they were even suppliers to Elwell is a matter for conjecture at this time, since it is a name that has only recently come to the fore.
Nigel