But ... it could very easily be Vasart Ltd (1956 - 1964)!
The unevenly ground out base would fit for being pre-Strathearn. The twist canes are of the "chunky" style seen in lots of Strathearn weights, but the blue tinge to those twists could suggest an earlier period.
(Does Anyone have a signed or labelled Strathearn weight that has the blue-tinged twist canes?)
Most (I won't be brave enough today to say "all") of the millefiori canes are early Ysart (i.e. from the 1946 - 1954 period or maybe even pre-war.) However, early Ysart canes were used in all of the Vasart / Strathearn periods right up to 1980.