>>> from numberplate import correct_numberplate

>>> correct_numberplate('7732 CHW')
True
>>> correct_numberplate('7FG2 CHW')
False
>>> correct_numberplate('7216 TBS')
True
>>> correct_numberplate('7216 BB3')
False
>>> correct_numberplate('7276 OEH')
False
>>> correct_numberplate('7276 tnt')
False
>>> correct_numberplate('7276BCD')
False