He skilfully took advantage of the alarm of the German Protestants after the battle of White Hill in 1620, to secure the coadjutorship to the see of Bremen for his son Frederick (September 1621), a step followed in November by a similar arrangement as to Werden; while Hamburg by the compact of Steinburg (July 1621) was induced to acknowledge the Danish overlordship of Holstein.
Ultimately, in July 1860, Errington was deprived by the pope of his coadjutorship with right of succession, and he retired to Prior Park, near Bath, where he died in 1886.