Just to support JP, Max and Andy these vases are common at fairs, local auctions, 'antiques' centers etc. in and around London. From memory they started to appear around 5 years ago almost always alongside freshly imported Far Eastern repro 'antiques'.
I live a few hundred yards from Talisman, it's a very swish looking decor shop, but not a reliable source of information on glass. If I were offered 10% of what I suspect Talisman are asking I'd take the money and run.