Thanks for all your help everyone. We can't include all of the good ideas in one night but this is what we have on out tentative play list.

Beer, Glorious Beer   
Bless 'em all
Come Inside
Dahn the Plug'Ole
British Workman's Grave
Danny Boy
Dirty Old Town
The Fields of Athenry
It's a Long, Long Way to Tipperary
I've Got a Lovely Bunch of Coconuts
Kilgarry Mountain
Knees Up, Mother Brown
Lambeth Walk
Maggie May
Maybe it's Because I'm a Londoner
My old man's a dustman
The Old Sow Song
Pub with no Beer
Putting on the Style
Ramblin` Rover
Seven Dear Old Ladies
Silicone Cindy
Size Doesn't Matter
Streets of London
Whiskey Johnny
Wild Rover
Ragland Road
This land is your land