Difficult one, as you move into the operetta genre. But I hope this helps:

The Arcadians
1909 Shaftsbury Theatre

The Chocolate Soldier
1910 Lyric Theatre
(First performed in US 1909 tho)

Chu Chin Chow
1916 His Majesty's Theatre

The desert Song
1927 Dury Lane Theatre
(First performed in US 1926 tho)

Florodora
1899 Lyric Theatre

Hit the Deck
1927 Hippodrome

Irene
1920 Empire Theatre
(First performed in US 1919 tho)

Lady, Be Good
1926 Empire Theatre
(First performed in US 1924 tho)

The Maid of the Mountains
1917 Daly's Theatre

The Mikado (G&S - operetta?)
1885 Savoy

No, No, Nanette
1925 Palace Theatre

Oh, Kay
1927 His Majesty's Theatre
(First performed in US 1926 tho)

Priates of Penzance (again G&S)
1879 Bijou Theatre

Rose Marie
1925 Dury Lane Theatre
(First performed in US 1924 tho)

Sally
1921 Winter Garden Tehatre
(First performed in US 1920 tho)

Tip toes
1926 Winter Garden
(First performed in US 1925 tho)

A few more US musicals from before that era. They all claim to be musicals, however, I'd argue the G&S cos I hate that sort of stuff!

Hope this is useful
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