There are many threads about this topic. Below are a couple I ineresting ones:
http://forum.purseblog.com/mulberry/your-mulberry-where-was-it-made-and-is-766536.html
http://forum.purseblog.com/handbags-and-purses/authentic-mulberrys-also-made-in-turkey-or-china-51231.html
Personally, my favorite mulberry is tricolor primrose, made in Turkey.
The made in England tags haven't assured me of "superior" quality, yet--just a street cred. thing, maybe, fueled here.
All my others bags have those England tags. Perhaps if I resold, this would matter more in useful terms?
Just really nice bags, wherever assembled factory-wise, imo.