Why not the Flanders & Swann song THE ENGLISH

Then there's DRINK OLD ENGLAND DRY, but there's a verse missing in DT:

Then up spoke Lord Roberts a man of high renown,
He swore he'd be true to his country and his crown,
For the cannons they may rattle and the bullets they may fly,
Before that they should come and drink old England dry.

Or THE ROAST BEEF OF OLD ENGLAND

If you've got a good baritone voice you could always try "The Yeomen of England" from the light opera "Merry England" - words by Basil Hood, but music (rather paradoxically) by Edward GERMAN.