Yes, there were plenty of electric fences around the farms in much of Cumbria, and there were farms around the edges of both Whitehaven and Workington.
There was one in the field at the bottom of the garden, and it was moved regularly further across the field so that the cattle had an extra strip to graze on. i had a fair few shocks off it!
I think either this was really just a shock, or if it was electrocution it could have been any form of misadventure - touching a cable from the mains if transformer was used to lower the voltage, getting equipment somehow involved with overhead wires etc etc.
Do you know the name. Cass, and then if a date of death were found, we could find out whether or not he died in connection with the fence.
Good luck.
Emms