Registration numbers 711901, 711902, and 711903 were all registered on 23 March 1925 by Young and Hodgson Ltd.
[Source: The Glass Association's "Blue Book" Registration Numbers 1908 - 1945]
Young & Hodgson were glass and china dealers, not manufacturers, so the maker of the piece is still unknown.
An entry in the 31 Jan 1908 London Gazette gives this announcement about the firm:
NOTICE is hereby given, that the Partnership heretofore subsisting between us the undersigned,' Walter Sanderson and Henry James Young, carrying on business as China and Glass Dealer.*, at 21, Red Lionsquare, Holborn, under the style or firm of "SANDERSON AND YOUNG." has been dissolved by mutual consent as from the 31st day of December, 1907. All debts due and owing to or by the said late firm will be received or paid by the said Henry James Young. And such business will be carried on in the future by the said Henry James Young, at 60, Shoe-lane, Hoiborn, London, under the style of Young and Hodgson.—As witness our hands this 23rd day of January, 1908.
H. JAS. YOUNG. WALTER SANDERSON.