thanks again Anne for the links, and my thoughts, in no particular order, are:
Not sure that this colour is Davidson - I stand to be corrected, but this piece is a very greeny blue, and having looked thru the Davidson 'between the wars' and 'post WW2' pieces, I don't recall seeing this hue. Neither do I think it is a Sowerby colour.
Looking at your pics. of Sowerby items, the main (clear) 'Boat' vase is an item that turns up not infrequently at boot sales, and is a design of which I have an example - believe it is pattern 2634 and occurs certainly from 1940 onwards, and may well have been in existance even earlier. Forgive me being a little pedantic.......the fluting is dissimilar.......on the boat they come to a sharpish ridge......on my piece they are rounded......and at the base they finish differently. Again, taking these two items as examples, the pressed star pattern on the base shows reasonable differences. Not conclusive, I agree, and to be fair without the two in front of you it is impossible to appreciate the differences. Fatal for me to be dogmatic (especially as I don't like pets), but I sense mine is Continental - it just has that look. But, hey, I've been wrong too many times, and you are far more knowledgable than me. thanks again

I think I'm yet to find my vase tho.
P.S. It's an ill wind and all that.........amazing what you find when you start looking at catalogues, as you will see from a couple of other pieces I'm about to post - which were found whilst looking for this vase.