Hi Pete, welcome to AditNow
Congratulations on owning such a nice artefact, GR- sounds like a Protector lamp, manufactured in Eccles, Manchester. Pretty common but very nice well-made lamps. A genuine colliery lamp will probably have some nice dinks and scrapes to add to its patina of age.
Uploading photos is straightforward. at your 1-oclock position, see the Moore Books Ad? Just above go to My Aditnow / Personal Album / Upload Photos.
hope this is helpful
MARK