Thank you Sue for your response and for the pic to refer to.
From the picture I wouldn't say that my one was Avondale.
In fact, my one looks a bit like the Wedgwood only slightly bigger and not obviously etched to the base as the Wedgwood ones are. Did Stennett-Willson produce mushroom paperweights at his Kings Lynn factory? I know that there are paperweights and candlesticks which match the later Wedgwood versions but, being unmarked, are attributable to the Kings Lynn factory.
Regards
Ronnie