I know Ruger did a number of Service Sixes for Great Britains law enforcement. Cabela's even has a couple listed in their fine gun library.
http://www.cabelas.com/cabelas/en/c...tory/lehi/handgun/774599_rssmm38_leh.jsp

http://www.cabelas.com/cabelas/en/c...lacey/sale_rack/774601_rugspeed6_lac.jsp