need help with a sed script

I absolutely just do not understand sed...
I have a ton of files and scripts I've collected over the years. Through the
course of time I was adopted and my name was changed, now I am changing it
back to my original name and I want to change my nme in all my scripts...
this is lame and tedious no doubt, but something for fun.

All my scripts are located in a series of folders contained under my Documents
folder. Basically, I need to find every file that contains the word 'England'
and replace it with 'Aubrey'

Can someone help please?
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