Thanks for that, rob, that is a mega resource and will take a while to work through but a quick look through reminded me of a couple more I have added to my revised list:
A sailor's not a sailor
A-Roving
Blow the Man Down
Bold Reilly
Cockles & Mussels
Drunken Sailor
Eriskay Love lilt
Fathom the bowl
Green Grow the rushes Oh
Grey Funnel Line
Ilkla Moor
John of dreams
Let the back and the sides go bare me boys
Lincolnshire Poacher
Little Brown Jug
Mingulay Boat Song
Oh! No John!
Road to the Isles
Rolling up, rolling down
Shenandoah
Strawberry Fair
South Australia
The Mermaid
Waltzing Matilda
Westering Home
When all men sing
Widdecombe Fair

More suggestions welcome.
Robbie