The Christianity developing in the British Isles may have developed differently, but the fervor with which missionaries felt it should be spread was the equal of any 1st century apostle. Missionaries such as Patrick and Finnian of Clonard christianized Ireland, the Irish then christianized the Picts, then St. Columba focused on Scotland. (In all this, the Anglo-Saxons seem to have been left alone. The counties stories of the spread of Christianity in the first several centuries don't include anyone going on missions to southern England, until Pope Gregory I sends Augustine of Canterbury in 597 to preach to them.)
With all the islands converted, Irish missionaries looked for farther goals...and there was a whole continent waiting. One of the most successful Irish missionaries was Columbanus (543 - 615). He first went to Burgundy, establishing schools until he was exiled from there by Theuderic II. He went to Austria and established an abbey there. When Theuderic took over that part of the continent, Columbanus fled to Italy and established a scholar Bobbio.
His schools raised hundreds of Christians with the same philosophy of mission work, establishing monasteries in Belgium, France, Germany, and Switzerland. The legacies of St. Gall and the Scots Monastery can be traced back to Columbanus and his schools.
The Íslendingabók ("Book of the Icelanders") written between 1122 and 1133 mentions Irish priests already in Iceland when the Norse arrived.
The 14th and 15th centuries saw a decline in the number of Irish monks traveling to Europe and joining the monasteries. Monasteries in Nuremberg and Vienna were given over to German groups. The Scots Monastery was handed to a Scottish congregation in 1577 by papal decree.
Enough about missions from Great Britain. What happened when a mission came to Great Britain? Did Augustine have an easy time of it, with the Christians nearby? We'll find out tomorrow.