Recommended saddler to widen saddle

I have a Farrington GP, and my usual saddler narrowed mine. He has also widened other saddles in the past. I would think most would be able to do this.
I'm north hampshire but don't think mine would go that far
 
Saddle Doctors sold me my Farrington VSD back in 2010 and have refurbished and narrowed it in the past - they’re based in Oxford. Such a comfy saddle and still going strong!
 
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