Dave
That badge is for Grimsby Municipal Tramways.
Looking at Bosleys' one here
http://www.mycommissionbid.com/bid/viewitem.php?id=307 it also matches the tramways badge shown and the one on the conductors' caps.
You can see the photos of it in use the by tram conductors here:
http://tramwaybadgesandbuttons.com/p...4/page204.html