Chris — thanks for putting me right.
Jackson tells us that UGB Sherdley made the Kingfisher bowl, pattern P262, in flint and dark amber until 1948, on one of two American machines installed in 1931 devoted to making pressed glass tableware. Probably the best known pattern made on these new machines was Ripple (jug P370, tumbler P417), made 1938–48.
Ravenhead Glass was formed from the newer of the two UGB glassworks near Ravenhead Colliery. All in all, UGB comprised some half dozen glassworks on Merseyside.
I couldn't have been more wrong previously!
Bernard C.