thanks to both of you for taking the time to reply

Of course, had I remembered the word 'Royal', I would no doubt have found the link - but I wonder why the word 'Royal' - and do we know when the Canning Town Glass Company was active. Rather a coincidence that the last two posts to show this pattern were both for a 'pair' of vases - and I assume we are talking of the Canning Town as in a suburb of Greater London, UK.