if you look at the pieces in Hajdamach page 110 (C20 British Glass), and Jackson page 196 (C20 Factory Glass) - two of which are repeated anyway - the blue swirled spatter seems quite a pronounced feature and common to all three pieces. In Christine's picture I can't see this feature - how important is the 'swirl' in terms of provenance for Caerleon - anyone know?? Attractive piece though - was it sold as Caerleon?
Can't think of where to look for more examples...........there isn't anything in Williams-Thomas, other than a text description.