janet - I have come across this bow tie mark several times over the years and still do not know who it's by (mainly in cornwall)sorry.
Pat - Jennie Phillips - (Dorset/Somerset)?
Paul N. -
I've just bought a similar little vase with this exact mark on......and a paper label!
It's BW Pottery, Byfield, Northants. I can't find any ref. to it on WWW so I would assume that it was closed by the 1980's.
Karen - Brilliant Paul, thank you so much. I have three of them and they are more like flasks than vases.