AHC: Anglicize western Germany

How could an area roughly corresponding to the Federal Republic of West Germany, minus Bavaria, be Anglicized?

The Norman conquest must have happened.

The later the POD the better.
 
Honestly the only possibility I can think of is a permanent inclusion of Hanover (and perhaps the surrounding minor kingdoms in the North-West) into the UK; from there, one can let linguistic influences abound.

I don't know how likely that is, however.
 
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