After repeated listenings, this is the best I can get for now.
Any and all amendments or suggestions to bridge the gaps, correct the mishearings and generally complete the sense will be gatefully received, by me as well as by Jennifer, who asked about it in the first place!

Victoria

The lion and the unicorn were fighting for the crown
When up got Irish tether and they both came tumblin' down
Their Second Guards departed too from Stephen's Green in town
But they're comin' down for you, Victoria.

Chorus:
Victoria, they're coming for you soon
Victoria, it may be when the moon
Is shinin' on December frosts or on the flowers of June
But they're comin' down for you, Victoria.

A gas main burst in Belfast on the eve of poppy day
And loyal lords at Windsor too moved rapidly away
Came the dawn in Dublin and a naughty soul, they say,
Sent a message from the captain/capital to Victoria.

George he lost a city(?), King Billy lost his head
The lion lost his balance and the unicorn he fled
As sure as you're a ...............(?) lump of lead
They'll be comin' down for you, Victoria.

Nelson's weather eye, they say, was looking out for ...(?)
They're nervous in the Phoenix Park and round old Dublin's ...(?)
But whosoe'er the streets of ...(?) and whosoe'er the ....(?)
They've a double date with you, Victoria.

Shoh slaynt,

Bobby Bob