Preheat the oven to 180°C/gas mark 4. Place the ham in a heavy roasting pan.
Mince the garlic in a food processor fitted with a steel blade. Add the chutney, mustard, brown sugar, orange zest and orange juice, and process until smooth. Pour the glaze over the ham and bake for 1 hour, until the ham is fully heated and the glaze is well browned.