I've been out of Sheffield for a bit but I know they are a bit territorial, and don't tend to venture all that far from their own patch from experience (much like a lot of the trades). An area of the City might help others assist you further.
In reply to mostly harmless:
I'd give Lois a call at LC Electrical Ltd, she's an absolute star.
(Don't have the number handy, sorry, but I'm sure it's easy enough to find online.)
Podcast Mountain Air - 11. Steph McKenna, Award-Winning Mountain Campaigner
News Lorraine McCall Starts Grahams Round
Lorraine McCall began her attempt today at a continuous, self-powered round of the Grahams, a four-month tour of upland Scotland combining walking and bikepacking. If successful, she'll be the first person that we know of to do it.