The well-leafed book in Newcastle Library " Dictionary of Tyne Sailing Ships 1830-1930"
contains an a-z of info, including coal ships ( ie "Colliers" ) taking their cargoes all over the world, including Norfolk. The number of wrecks, mishaps, etc reveal how dangerous the trade was. The sailors strove to arrange the take on of ballast, to ensure ship stability, rather than return to the north-east empty.
Sometimes the ballast was human, folk leaving Norfolk after failed harvests.
Some numbers of people movements........
1861 Census info.....
Northumberland pop = 336,385. Includes 1024 Norfolk-born. 14917 Ireland-born
County Durham pop = 497,668. 2166 Norfolk-born. 27371 Ire-born
Lancashire pop = 2,406,678. 2306 Norfolk-born. 215,697 Ire-born
Wales pop =1,151,033. 590 Norfolk-born. 25840 Ire-born.
I added the Irish immigration as it was a similar agricultural problem.
Michael.