The wild bogs of Albion were not very deeply Romanised. It is true that the most developed parts of Roman Britain - the south-east, were thoroughly Germanised, so any Latin speaking pockets there were destroyed. Anybody know anything about Latin use in Britain c.350-400?
Still, all three parts of Roman Britain not conquered by the Saxons and Angles were Celtic speaking. And the refugees to the continent also must had been partly/largely Celtic speaking as well.
All in all, I do not believe a Roman Hibernia and the Limes across Lanark would change anything much. The insular provinces were simply too poor, distant, primitive to have an impact.
The Irish monastic brand of Christianity looks odd only when viewed through a purely late Western Christian perspective. If one looks at it from an Eastern Christian perspective, the predominance of monasteries is not so unusual.
Borys

