Zik-


Where do you live? If in Europe, you may find that Fiochhi or Geco load .38 S&W ammunition. It may be more available there than in the USA.

Your gun probably had a bright blue finish, unlike the later one pictured here by Dr. Pig. Those earlier ones also had checkered (US spelling) stocks with a silver medallion. It may have been altered since leaving British service.
If you can post a photo, we can help more.

Welcome to the board.