I hope that this may be useful? It appears to be a well researched paper on UK Gun Law especially as it gives stated cases in respect of UK Gun Law.
http://www.lawcom.gov.uk/wp-content/uploads/2015/07/Firearms_and_the_Law_R-Fortson_090715.pdf
http://www.lawcom.gov.uk/wp-content/uploads/2015/07/Firearms_and_the_Law_R-Fortson_090715.pdf