Possible Clues:

• Boadicea's part in the Celtic enigma
• Ancient tribesmen taking diamonds to the Province
• Some revolting Brits (Essex types)
• Ancient tribesmen had diamonds and nickel
• Rebellious tribe retreating from Levantine city
• Tribesmen I observe close by, say
• Boudica's tribe
• Ancient British tribe or nice new one
• Country losing territory on North Island to old Britons
• British rebels rising up in Argentine city