Hello Kieran,
I'm afraid that you're not comparing like with like here. Your vase has what appears to be, and you say are, ground circles as decoration, whereas the vase on eBay (which is NOT by Pro Strom) is decorated with internal regular air bubble decoration. It is S&W/Royal Brierley, and the blogspot will be changing the Alsterfors attribution (if they haven't already).
I would say your piece was retailed fairly recently through T K Maxx, since I saw them there only last year!
Now for a sweeping 'catch all' statement - a warning for all glass buyers/collectors in the UK, question anything that is modern and large, since more often than not these days it will have passed through the doors of T K Maxx. I go there regularly to keep an eye on what is going to appear at the fairs and at auction. That is not to say that they are not attractive or don't have value, rather it will take a long time for the market to decide what secondary value they have. They are therefore only worth whatever the eye of the beholder wants to pay.
T K Maxx tends to sell a lot of glass from China, India, Romania and Poland, although there are other sources.
Nigel