You can change your will at any time, but do not attempt to change your will by simply altering it or writing on it, as this will invalidate your will. You should review your will regularly to ensure it still meets your requirements as your circumstances change, otherwise problems or complications can arise.
Getting married, or entering into a civil partnership after your will is made will generally cancel it, unless the will says it will not.
Divorce or dissolution of civil partnership also affects a will, but does not cancel it. If you divorce or dissolve your civil partnership after your will is made, any reference to your former spouse or civil partner will be treated as if he or she had died on the day that the decree absolute or final dissolution order was made.